More from Explorations of an Ecologist
I have recently returned from an excellent tour of northern Colombia for Quest Nature Tours. This was my fourth time guiding for Quest here, in the birdiest country in the world. Birdiest may be a bold claim, but eBird shows 1,956 species recorded for Colombia, while the Colombian Committee of Ornithological Records lists 1,969 species. Second and third place fall to Peru and Brazil, respectively, though neither country has reached 1,900 species yet. I've spent more time in Colombia than any other Latin American country, and I love coming back for more! Glaucous Tanager This tour was a short and sweet ten days visiting the Santa Marta mountains and the Caribbean coast in the far northern reaches of Colombia. One advantage of this tour is that it focused on a relatively small geographic area, meaning that we had no internal flights and minimal long drives. If you are going to pick just one area of Colombia to visit, this would be a pretty good one due to the high number of endemic species; that is, species found found just here and nowhere else in the world. The Santa Marta mountains present an interesting study in biogeography as they have been isolated from the main Andean chain for 10-15 million years. Many of the bird species found here (at least 28 species) are endemic to these mountains. A high ratio of endemism is found with its many plants, lizards, frogs, insects, and more. Vermilion Cardinal (male) Orange-chinned Parakeets In total we found nearly 340 bird species during our tour including a high percentage of the Santa Marta endemics. We also spent some time in the varied habitats along the north coast of Colombia, from the desert scrub of La Guajira to dry tropical forest of Tayrona National Park, from mangrove-lined estuaries filled with flamingos and shorebirds to productive freshwater marshes full of life. And of course there was so much to see besides the birds - we enjoyed endemic primates, a nice array of lizards and frogs, countless butterflies and beetles and abundant plant life. I set up my moth lights in a few montane locations which attracted quite a bounty. All in all it was a fantastic trip. Scaled Dove Cope's Ameiva (Ameiva bifrontata) Blue Ground-Dove We met up as a group at our hotel during the evening of March 13 for our welcome dinner, and discussed the possibilities of what the next week and a half would bring. It was good to reconnect with Cristian Daza who was to be our local guide for the duration of the trip. I have worked with Cris on numerous occasions in the past and it was wonderful to catch up with him. Before dawn the next morning we were on our way. Our first stop was a famous birding road called the Kilometre Four Road, just outside of a small village called Palermo. Russet-throated Puffbird Kilometre Four was a great way to kick off the trip. The habitats here consist of open farmland, stands of woodland, agricultural plots and wetland, and bird diversity is very high. In just a couple of hours we tallied around 90 bird species with our local guide, Omar. Many of them are localized to this region, including Colombian endemics like Turquoise-winged Parrotlet, Chestnut-winged Chachalaca and Sapphire-bellied Hummingbird, as well as other localized species such as Caribbean Hornero, Stripe-backed Wren and Northern Screamer. We also found a Belted Kingfisher here at the southern part of its wintering range. Black-crested Antshrike Chestnut-winged Chachalaca Northern Screamer Cattle Tyrants on a domestic buffalo Caribbean Hornero Stripe-backed Wren Our next stop was a boardwalk traversing through mangroves at Isla de Salamanca National Park. We improved our views of the localized Sapphire-bellied Hummingbird, and found some other interesting species like Bicolored Conebill, American Pygmy Kingfisher, Golden-green Woodpecker and Red-rumped Woodpecker. Several Prothonotary Warblers were flitting around the mangroves. In just a matter of days they will likely be winging their way north, perhaps as far north as where I live in southern Ontario. Birding at Isla de Salamanca Sapphire-bellied Hummingbird Golden-green Woodpecker We found a Spectacled Caiman and a Colombian Slider at Isla de Salamanca as well. The latter was a new species for me, so I was pretty happy with that! Butterfly and dragonfly diversity was also relatively high at this site. Spectacled Caiman (Caiman crocodilus) Colombian Slider (Trachemys callirostris callirostris) Caribbean Yellowface (Neoerythromma cultellatum) Eastern Amberwing (Perithemis tenera) Pin-tailed Pondhawk (Erythemis plebeja) Spot-tailed Dasher (Micrathyria aequalis) By midday we had exhausted our birding options here (it had been a successful morning) and so we drove east to Riohacha, our base for three nights. As we traveled along the coast past the imposing Santa Marta mountains to our south, the forests became noticeably drier and sparser, eventually turning to desert scrub before we reached Riohacha. This is the most arid part of Colombia and it shares many unique species with northern Venezuela. We had two full days to take in the sights and sounds here. Desert scrub in Camarones During both days we drove west for half an hour to the village of Camarones, home of the Wayuu people, an indigenous group found in the Guajira peninsula of Colombia and Venezuela. With our local guide Alvaro we got to work finding the special birds of this region. During both days we spent the early morning hours birding the scrub, finding specialties like Tocuyo Sparrow, Chestnut Piculet, Buffy Hummingbird, Orinocan Saltator and a selection of flycatchers. Orinocan Saltators Calephelis laverna, a type of metalmark butterfly Tocuyo Sparrow Melocactus curvispinus, a type of turk's-cap cactus Double-striped Thick-knee Opuntia caracassana, a type of prickly pear cactus One morning, we visited the property of local birding guide Jose Luis who I first met in 2015 during my inaugural Colombia trip (Jose had guided myself and a few friends in the Camarones area). Now, Jose has established a bird feeding station where the incredible Vermilion Cardinal appears regularly. This is a flagship species of the region and we couldn't have asked for better view of El Rey de la Guajira. Sipping cold drinks in the shade while watching the cardinals and other birds was not a bad way to spend a couple of hours! Vermilion Cardinal (male) Vermilion Cardinal (female) Black-faced Grassquit (male) Black-crested Antshrike (male) Camarones is positioned at the edge of a large wetland that drains into the Caribbean. As you can imagine from the town's name, shrimping is a productive industry here and we made sure to get our fill of camarones al ajillo (garlic shrimp) at local restaurants here. We also went for a boat trip into the mangrove-lined wetland one day. Seeing many hundreds of American Flamingos was a highlight, but I was more excited to see my first Mangrove Rail for Colombia. Of course the heron and shorebird diversity was quite high here as well. Sailing near Camarones American Flamingos American Flamingos Mangrove Rail We ventured back west towards the Santa Marta mountains, breaking up the drive with a morning spent in the beautiful forests of Tayrona National Park. Tayrona is very close to the mountains and receives more rain than the Camarones area, leading to a much higher forest canopy. Our main target was the critically endangered Blue-billed Curassow. Our local guide Wilson found one for us, but it remained heard-only, unfortunately. Gray-headed Tanager Fiery Skipper (Hylephila phyleus) Colombian Red Howler Monkey (Alouatta seniculus) Our morning at Tayrona was quite productive. Many of the birds here are shared with Central America and this would be our only chance for them during this trip. We teased out many interesting species including Pale-bellied Hermit, White-necked Puffbird, Military Macaw, Plain-brown Woodcreeper and Lance-tailed Manakin, to name a few. We also had wonderful experiences with Colombian Red Howler Monkeys and the recently-split Santa Marta White-fronted Capuchin, while I had fun chasing down and identifying various lizards and frogs. Santa Marta White-fronted Capuchin (Cebus malitiosus) Gaige's Rainbow Lizard (Cnemidophorus gaigei) Milk Frog (Trachycephalus macrotis) Gaige's Anole (Anolis gaigei) Argiope submaronica, a type of orbweaver spider Having done quite well in the coastal areas, it was time to trade in our Mercedes Sprinter van for 4x4 Toyota Land Cruisers for four days in the Santa Marta mountains. During our first morning we found ourselves at the Gairama reserve, listening to the last Rufous Nightjar of the night while waiting for dawn to break. The scenery along this road is outstanding and we tallied a number of dry-forest birds here including Black-backed Antshrike, Long-billed Gnatwren, Whooping Motmot and White-bearded Manakin, while we also enjoyed a pair of Military Macaws. Sunrise birding at Gairama Reserve Astraptes sp., a type of skipper Black-backed Antshrike Ochre-bellied Flycatcher Next on the agenda was breakfast at a little finca further up in the hills beyond Minca. We enjoyed our scrambled eggs, arepas, cheese, fresh fruit and coffee, all while watching an active feeder setup that was attended by Golden-winged Sparrow, Blue-black Grosbeak, Blue Ground-Dove and a plethora of hummingbirds and tanagers. We even had some flyover raptors including Great Black Hawk, Short-tailed Hawk, Zone-tailed Hawk, King Vulture and a distant Black-and-chestnut Eagle. Brown Violetear Cocoa Woodcreeper Blue-black Grosbeak (pair) Golden-winged Sparrow King Vulture Our first night in the Santa Marta mountains was spent at a little ecolodge called Colores de la Sierra. The birding was quite good here and in a relaxed afternoon we found around 60 species which included Black-headed Tanager, Scaled Piculet, Bran-colored Flycatcher and Pale-breasted Spinetail. The scenic viewpoint with panoramic views was a nice setting for us to go over our bird list, enjoy a few cold beverages, and watch the sunset before listening to a Collared Forest-Falcon and a Tropical Screech-Owl. Life is good. Doing our species checklist at Colores de la Sierra Bicolored Wren Swallow Tanager (male) Pale-breasted Spinetail Scaled Piculet One of the participants, Reiner and I also set up our insect-attracting lights at Colores de la Sierra and had a decent haul of moths and other insects to photograph. Copaxa multifenestrata, a type of silkworm moth Central American Paper Wasp (Apoica pallens) Dithecodes sp., a type of geometer moth Walker's Moth (Sosxetra grata), a type of cutworm moth Hylesia sp., a type of silkworm moth The next morning we ventured higher into the mountains, into the range of our first Santa Marta endemics. With local guide Jeider, we visited a local coffee farm called Finca Vista Nieves where a feeding station has been established for Black-fronted Wood-Quails. In recent days, a surprise Rufous-necked Wood-Rail has also been attending! This is a rare species that is typically found in coastal mangroves, not secondary forest high up in the mountains, and it was also a new species for both Cris and I. Though the Black-fronted Wood-Quails vocalized quite close to the feeding station, they just wouldn't come in. However, we did have excellent views of the Rufous-necked Wood-Rail and other endemics like Sierra Nevada Brushfinch, Santa Marta Brushfinch and White-lored Warbler, as well as a pair of Rusty-breasted Antpittas. White-lored Warbler Rusty-breasted Antpitta Sierra Nevada Brushfinch A walk along the edge of the coffee farm produced more endemics - Santa Marta Foliage-gleaner and Antbird - as well as a pair of Groove-billed Toucanets, a Black-and-chestnut Eagle seen well in flight, and a stunning male Rosy Thrush-Tanager. The latter is the only member of its family (Rhodinocichlidae), where its closest living relatives are the longspurs/buntings of Calcariidae. Santa Marta Foliage-gleaner Groove-billed Toucanet Highland Rubyspot (Hataerina cruentata) Rosy Thrush-Tanager We continued higher into the mountains, making birding stops along the way, until our arrival at the El Dorado Lodge situated at around 2000 m elevation. Upon arrival we were greeted by a pair of White-tipped Quetzals. Stunning birds, and a strong contender for bird of the trip. Santa Marta Blossomcrown El Dorado Lodge White-tipped Quetzal (male) White-tipped Quetzal (male) Anticipation was high the next morning. This would be the day that we explored the San Lorenzo ridge where many of the Santa Marta endemic species can be found. An early wake-up was in order, as the eight-kilometre drive takes just under two hours by 4x4. But the rough ride was worth it when we experienced an epic sunrise on the San Lorenzo ridge. Colombia's tallest peak, the snow-covered Pico Cristóbal Colón, loomed off in the distance. Sunrise on the San Lorenzo Ridge Though the winds were high, we managed to connect with most of the endemic birds over the course of the morning. We managed exceptional views of both endemic antpittas (Sierra Nevada and Santa Marta Antpittas), Santa Marta Warbler, Yellow-crowned Redstart, and White-tailed Starfrontlet, to name a few. Black-cheeked Mountain-Tanagers showed well, though the other endemic tanager, the Carriker's Mountain-Tanager, remained heard only. A couple of cheeky Crab-eating Foxes were lurking around, hoping to share our breakfast. The plant life and butterfly diversity was quite enjoyable up on the ridge. Southern Emerald-Toucanet (Santa Marta subspecies) Hermit Wood-Wren Sierra Nevada Antpitta Crab-eating Fox (Cerdocyon thous) Pedaliodes phazania Birding at the San Lorenzo Ridge We really enjoyed our two-night stay at the El Dorado Lodge and we lucked out with an amazing sunset one evening and sunrise one morning, despite being fogged out for some of our stay here. The birding opportunities were great around the lodge; highlights included Rusty-headed Spinetail, Brown-rumped Tapaculo, Lazuline Sabrewing and heard-only Barred Forest-Falcon. Some of the group had a lucky encounter with a Gray Tinamou, while an afternoon walk from the lodge back to the main road produced Gray-throated Leaftosser, Golden-breasted Fruiteater and Golden Grosbeak. Sunset at the El Dorado Lodge Masked Trogon Central American Agouti (Dasyprocta punctata) Lazuline Sabrewing At night, some of the group was successful with hearing a Santa Marta Screech-Owl, while we also experienced several endemic frog and lizard species as well as an endemic tarantula. Reiner and I each set up our insect-attracting lights. The bounty was incredible and we photographed around 200 species of moths in just one evening. Sphinx moths in particular were well-represented, with over 100 individuals of at least twelve species. Eulepidotis rectimargo, a type of erebid moth Sarosa helotes, a type of tiger moth Rhodochlora endognoma, a type of geometer moth Xylophanes titana, a type of sphinx moth Paromenia sp., a type of leafhopper Symphlebia citrarius, a type of tiger moth Wittinia zebra, a type of flannel moth Xylophanes ceratomioides, a type of sphinx moth Pityeja histrionaria, a type of geometer moth Idalus herois, a type of tiger moth Bertholdia albipuncta, a type of tiger moth Our final morning in the mountains was spent cleaning up some targets, including the endemic Black-backed Thornbill and the endemic subspecies of Cinnamon Flycatcher, before heading back down to the coast. Golden Grosbeak Black-backed Thornbill (immature male) City of Santa Marta, as seen through a hole in the clouds from the Santa Marta mountains Mimardaris aerata, a type of firetip skipper Cinnamon Flycatcher (Santa Marta race) Our last day of the tour was spent visiting Ciénaga Grande de Santa Marta. This is the largest wetland in Colombia (over 4,200 km2). Highlights during our day here included a Bare-throated Tiger-Heron, several "trip birds" in American Coot, Cocoi Heron, Fulvous Whistling-Duck and Black-collared Hawk, and a visit to the floating village of Buena Vista where we enjoyed a lunch of fresh caught snapper with lentils, smashed plantain (patacones) rice and blackberry juice. That evening we returned to Barranquilla where we enjoyed our farewell dinner. It was a wonderful trip and I can't wait to return in the future! Floating village of Buena Vista Cocoi Heron
In November I visited The Gambia along with ten travellers from Quest Nature Tours. Why The Gambia, you may ask? This tiny country is not well-known to the international community, but it is an attractive ecotourism destination. The Gambia is a stable, English-speaking democracy that has a relatively high diversity of species given its tiny size. Egyptian Plovers Guinea Baboons (Papio papio) Its borders follow the Gambia River (with some buffer on either side) and it is surrounded entirely by Senegal. The Gambia is a popular destination for Brits and other northern Europeans due to convenient direct flights and beautiful beaches. While most tourists stay close to the resorts along the coastline, there is so much more to see in The Gambia by traveling up-country. Scarlet-chested Sunbird Black-headed Lapwing In west Africa there is one distinct rainy season which usually occurs between May and September. This contrasts with east Africa which typically has two rainy seasons (one from March - May, and a shorter one from October - December). Our trip to The Gambia was timed to occur at the beginning of the dry season. Many birds were active and still in breeding plumage, while our days would largely be rain-free, making birding easier. Beautiful Sunbird Greater Blue-eared Starling We began the tour with two nights at a resort along the Atlantic coast. Each day we were up early to make the most of our explorations before the heat of the day set in (but not too early, since sunrise isn't until 7 AM). We acquainted ourselves with some of the spectacular bird species that call this corner of Africa home. Our first morning at Brufut Woods was a bit overwhelming given the colour and diversity of the species. The vast majority were new for me as well, as this was my first time visiting sub-Saharan Africa. African Gray Hornbill Western Plaintain-eater Northern Red Bishop Hamerkop Some of the highlights from Brufut included Guinea and Violet Turacos, an exquisite African Pygmy Kingfisher, Red-cheeked Cordonbleu, Northern Puffback and four species of sunbirds. We enjoyed watching the antics of Rainbow Agamas and Gambian Sun Squirrels, too. Red-cheeked Cordonbleu Northern Puffback African Pygmy Kingfisher Rainbow Agama (Agama agama) Gambian Sun Squirrel (Heliosciurus gambianus) The coastal mangroves and scrubby areas were filled with interesting species as well, including Giant Kingfishers and our only Swallow-tailed Bee-eaters of the trip. Some other standouts included Blue-bellied Roller, Black-headed Paradise-Flycatcher and Little Bee-eater. Giant Kingfisher Swallow-tailed Bee-eater Blue-bellied Rollers Black-headed Paradise-Flycatcher Before commencing our journey up-country we stopped at Farasuto Forest. This community forest is found in the hometown of our local guide, Mustapha, and he is also a board member here. Farasuto came through with a roosting pair of Grayish Eagle-Owls, shown to us by a local guide. We also found a whole host of new species for us - Vieillot's and Bearded Barbets, great comparison views of both wood-doves, and our only Dideric Cuckoo, Beaudouin's Snake-Eagles and Striped Kingfishers of the trip. We also found a West African Banded Cobra (Naja nigricollis), a huge highlight for the herp enthusiasts in the group. Grayish Eagle-Owl Common Tiger Blue (Tarucus theophrastus) Bearded Barbet Dark Chanting Goshawk Blue-spotted Wood-Dove African Wood White (Leptosia alcesta) We drove east for a couple of hours towards Tendaba Camp. Located on the shores of the mighty Gambia River, and situated near the wild and vast Kiang West National Park, this would be our base for two nights. Our morning boat trip up a mangrove-lined tributary was simply amazing. We set off shortly after dawn in an uncovered boat with our local guides and experienced a huge diversity of species throughout the morning. Mangrove boat trip at Tendaba Camp Reed Cormorant African Sacred Ibis Malachite Kingfisher with an Atlantic Mudskipper (Periophthalmus barbarus) Mouse-brown Sunbirds were feeding nestlings in their river-side nests, the air was filled with the songs of Brown-throated Wattle-eyes, and Blue-breasted Kingfishers were perched around every bend. We found our only African Blue Flycatchers of the trip and enjoyed our first views of Yellow-crowned Gonoleks, Malachite Kingfishers and both European and White-throated Bee-eaters. Mouse-brown Sunbird Brown-throated Wattle-eye Blue-breasted Kingfisher White-throated Bee-eaters Among the high diversity of wading birds were specialties like White-backed Night Heron (on a nest!) and Goliath Heron, the world's largest heron species. The latter was a personal highlight as it represented my 5,000th world bird species. It was great to share the moment with everyone! White-backed Night Heron Goliath Heron The scrubby habitats around Tendaba and in Kiang West National Park were filled with a different subset of species. We tracked down our first White-crested Helmetshrikes and found a scarce Brown-necked Parrot, while we also enjoyed birds like Grasshopper Buzzard, Purple Roller and Bruce's Green-Pigeon. We loved watching the antics of Guinea Baboons, Green Vervet Monkeys and Patas Monkeys. Brown-necked Parrot Green Vervet Monkey (Chlorocebus sabaeus) White-crested Helmetshrike We pushed further upriver by bus, reaching Janjanbureh Island for a two-night stay. The drive between Tendaba and Janjanbureh was made a touch longer as our bus got stuck on a muddy road. Thanks to some quick thinking by Mustapha and our driver, Momodou, we were able to source a tractor from a nearby town to free our bus, and we weren't delayed for too long. While we waited I took the group birding and we found African Green Bee-eaters and had incredible views of a Pearl-spotted Owlet. African Green Bee-eater Pearl-spotted Owlet One highlight of our time at Janjanbureh Island was a long boat trip along the Gambia River. This particular vessel was quite comfortable with an open upper level, covered lower level, bathroom and a cooler full of cold drinks. Though we were unable to find any African Finfoots (a scarce resident along the Gambia River), we found around 70 bird species including White-backed Vulture, Rüppell's Griffon, Palm-nut Vulture, Levaillant's Cuckoo and Woodland Kingfisher. Birding from the upper deck Borassus akeassii palms Rüppell's Griffon Palm-nut Vultures We also found Western Red Colobus monkeys along the riverside and spent some time with a few West African Chimpanzees. These chimpanzees were introduced here many decades ago and they have a self-sustaining population along some of the river islands. Wesern Red Colobus (Piliocolobus badius) Chimpanzee (Pan troglodytes) My next post will cover the remainder of the trip. Stay tuned.
Zapotén is a legendary birding area in southwestern Dominican Republic quite close to the Haiti border, and it is a must-visit site for any birder on Hispaniola. This rough track climbs high into the Sierra de Bahoruco, a beautiful mountain range cloaked in pine and broadleaf forests home to a high diversity of species. From a birding point of view, it is the most reliable site to find the localized La Selle Thrush as well as most of the other endemic species found in the mountains of the Dominican Republic. The only problem is that a high clearance 4x4 is required to traverse this road. But there is an easy solution for visiting birders. An ecolodge called Villa Barrancoli is situated only 40 minutes from the start of the rough road and its owner, Kate Wallace, regularly organizes 4x4 transport for birders. And so that is what we did. October 20, 2025 (continued) We arrived at Villa Barrancoli in the middle of the afternoon and were met by Kate. Originally from the United States, Kate is a passionate biologist and birder who has lived in the Dominican Republic for much of her life. Kate gave us a tour of the ecolodge and showed us to our cabins. We would be the only guests during our two night stay. Exterior of cabin - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Interior of cabin - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Washroom/shower building - Villa Barrancoli Ecolodge, Independencia, Dominican Republic The ecolodge is rustic but contains everything you need. Just don't expect luxury. The cabins were simple and came equipped with fans while the toilets and showers were in a nearby building. We found the price a bit steep (75 USD per person per night), but this included our meals and the location was perfect, even if the ecolodge itself was rather basic and in need of some upkeep. And having Kate organize our Zapotén expedition for the following morning was very helpful. Dan, Laura and I dropped off our bags and headed out for a pre-dinner walk. The ecolodge is situated next to a dirt road/trail called Rabo de Gato that probes deeper into the countryside, accessing dry forest and shallow wetlands. It is a very popular birding trail and many of the more difficult endemic bird species can be found here, including the Bay-breasted Cuckoo and White-fronted Quail-Dove. Rabo de Gato Trail, Independencia, Dominican Republic Laura came through with an excellent find. "I see a snake!" she yelled and I looked to see a sleek, striped snake vanish off the trail. Fortunately it did not go far. I saw it again and quickly pounced, coming up successfully with the serpent safely in my hands. A Cope's Antilles Snake. Cope's Antilles Snake (Hypsirhynchus parvifrons) - Rabo de Gato, Independencia, Dominican Republic Cope's Antilles Snake (Hypsirhynchus parvifrons) - Rabo de Gato, Independencia, Dominican Republic This is the same species of snake that Dan and I had seen road-killed that morning. The Cope's Antilles Snake is endemic to Hispaniola and it is closely related to several other species that are only found in the Caribbean. Like all Caribbean snakes, the Cope's Antilles Snake is nonvenomous and harmless. They prey mainly on small lizards such as anoles, of which there is no shortage of here. Cope's Antilles Snake (Hypsirhynchus parvifrons) - Rabo de Gato, Independencia, Dominican Republic Apart from the snake, our late afternoon walk at Rabo de Gato was fairly uneventful. We were unable to find our main target birds (White-fronted and Key West Quail-Doves, and Bay-breasted Cuckoo), though we managed a good look at a Zenaida Dove and a Scaly-naped Pigeon, both of which were new for Laura. We headed back to the ecolodge for dinner. Dominican Graceful Anole (Anolis distichus ignigularis) - Rabo de Gato, Independencia, Dominican Republic Despite a 3:15 AM wakeup call looming for the following morning, the three of us headed back out after dinner for an abbreviated night-hike. I manned the thermal camera while Dan and Laura scanned for herps and insects. I found a few heat signatures that turned into roosting birds - Broad-billed Tody and Black-and-white Warbler - while Dan and Laura found some interesting arthropods including a couple of vinegaroons. These arachnids are well-known for their defence mechanism of spraying acetic acid. This is the same compound found in vinegar, hence the common name. Hispaniolan Vinegaroon (Mastigoproctus proscorpio) - Rabo de Gato, Independencia, Dominican Republic Dan also spotted a couple of Brown Widow Spiders (Latrodectus geometricus), a species closely related to the Northern Black Widow which we have back home in Ontario. Though bites from Brown Widows are apparently painful, they are not as dangerous as bites from the Northern Black Widow. Brown Widow (Latrodectus geometricus) - Rabo de Gato, Independencia, Dominican Republic Unfortunately, despite using the thermal I was unable to find any Hispaniolan Solenodons (a large shrew-like creature that is one of only two species of terrestrial mammals native to Hispaniola), and Dan and Laura could not turn up any snakes. We checked the moth sheet once we returned to the ecolodge. It was covered with insects! Epitragus aurulentus - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Unidentified crambid moth - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Ethmia abraxasella - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Insulatitan youngi - Villa Barrancoli Ecolodge, Independencia, Dominican Republic Hieroglyphic Moth (Diphthera festiva) - Villa Barrancoli Ecolodge, Independencia, Dominican Republic With the 3:15 AM alarm quickly approaching we called it a night and headed off to bed. The Blue Jays were losing 3-1 partway through the critical Game 7 of the American League Championship Series at this point. October 21, 2025 "The Jays won!!!" Those were the first words I heard in the morning. Laura must have woken a few minutes before me and checked the score - indeed, they had a massive come from behind win, thanks to a three-run home run by George Springer to erase the 3-1 deficit. I could hardly believe it - the Blue Jays were going to the World Series for the first time in 32 years. Needless to say, the early wakeup didn't seem so rough following that news. Today was a day that we had been anticipating for weeks as it would be our expedition up the Zapotén Road. Our driver, Rafael, arrived at 3:50 and we loaded the cooler containing sandwiches, cookies and a thermos of coffee into the back of his Toyota Land Cruiser. This is the gold standard vehicle in so many parts of the world for tackling the roughest roads. The reason for our early wakeup was simple. We needed to be above the third army checkpoint before dawn since La Selle Thrushes can be reliably observed on the road for just a few minutes around 7am. And given the state of the road, it would take around two hours to reach this location. We stopped only once on the drive up when Rafael heard an Ashy-headed Owl hissing from beside the road just after the first checkpoint. Mere seconds later, he had found it in his spotlight. Clearly, Rafael was more than just a driver - he was a keen birder as well. We bounced along, slowly making our way up the mountain. We passed the second checkpoint, and then the third. Finally, at 6 AM we had arrived at our destination. Zapotén, Pedernales, Dominican Republic We downed the hot coffee while waiting for the sky to lighten. Above us was a most incredible display of stars. Off in the distance the first Hispaniolan Nightjars begin their distinctive song, followed shortly by the Rufous-throated Solitaires. Dawn was imminent and we needed to get moving. Zapotén, Pedernales, Dominican Republic All four of us were on high alert as we tiptoed along the road. Up ahead was a famous bend in the road dubbed "La Selle Thrush Corner" for obvious reasons, and the day was brightening up far too quickly. Would we be late for our date with this rare mountain thrush? La Selle Thrush Corner - Zapotén, Pedernales, Dominican Republic Our first Western Chat-Tanager appeared in the roadside shrubbery, delaying us by a minute or two. But we shouldn't have worried. Right at La Selle Thrush Corner was a solitary La Selle Thrush, hopping along quietly. We crept around the bend in the road, enabling much better views. Not two minutes later it had slunk back into the woods where it would likely remain for the rest of the day. We were lucky. La Selle Thrush - Zapotén, Pedernales, Dominican Republic This was our first time in the mountains proper and so we soaked in the sights. Zapotén, Pedernales, Dominican Republic Despite the clear skies earlier in the morning, now that it was daylight we noticed clouds rolling down the mountainsides, ready to envelop us. This was not good news. It would make finding another big target, the Golden Swallow, nearly impossible. It would also likely quiet many of the other birds. We kept an eye out for quail-doves on the road but this was not meant to be. Surely, we would have more chances for the endemic White-fronted Quail-Dove near the Villa Barrancoli Ecolodge later that day or the following morning. Zapotén, Pedernales, Dominican Republic The birding remained steady and we quickly found a pair of White-winged Warblers. These are not actually true warblers - rather, they are in the family Phaenicophilidae which is endemic to Hispaniola and which also contains the two species of palm-tanager and the Green-tailed Warbler. White-winged Warbler - Zapotén, Pedernales, Dominican Republic We heard several Hispaniolan Euphonias but they refused to be seen once again. The birding was a bit quiet, possibly due to the gloomy conditions. This satyr was the only butterfly species that we observed at the upper elevations. Calisto archebates - Zapotén, Pedernales, Dominican Republic A Hispaniolan Trogon started singing next to the road, though it slipped away before Laura or I managed a look. Luckily, we found a second one at the next bend in the road. These trogons can be common during the breeding season, but at this time of the year they are quiet and unobtrusive. Hispaniolan Trogon - Zapotén, Pedernales, Dominican Republic Watching the Hispaniolan Trogon - Zapotén, Pedernales, Dominican Republic Rafael turned out to be an excellent birding guide; not "just" a driver as we had been led to believe. He knew every sound on the mountain and had locations to try for most bird species. He somehow managed to spot this day-roosting Hispaniolan Nightjar. We were incredulous as to how he managed this feat. Surely this is a known roosting spot? A check of eBird shows no photos of this species taken during the day from this mountain which leads me to believe that he just randomly found this one for us. Incredible. Hispaniolan Nightjar - Zapotén, Pedernales, Dominican Republic By the time that we returned to the pine forest around the third army checkpoint, the threat of rain had diminished and the sun even came out for a brief moment or two. Rafael and Dan heard an Antillean Siskin (Laura and I were further up the road and missed it), and then a nice mixed flock passed through that contained our first Hispaniolan Elaenia. Hispaniolan Elaenia - Zapotén, Pedernales, Dominican Republic As I write this a week later, following eBird's taxonomy update, this is one of the new species that my life list has gained. When we were looking at this elaenia it was called the Greater Antillean Elaenia. I had seen the Jamaican subspecies last year. But the Greater Antillean Elaenia has now been split - each island now has its own endemic species. Hispaniolan Elaenia - Zapotén, Pedernales, Dominican Republic One of my most-wanted bird for this trip was the Hispaniolan Crossbill and we lucked into a female here. Crossbills are nomadic birds of North America's coniferous forests and back home in Ontario we can find White-winged and Red Crossbills. The Red Crossbill in particular has quite a lot of variation, with several varieties that have slightly different vocalizations and bill shapes. These races specialize on different conifer seeds. One of them feeds on Lodgepole Pines in southern Idaho and it has been split off as its own species called the Cassia Crossbill; all of the other races are, for now, still lumped within Red Crossbill. And here in the pine forests of Hispaniola there is a crossbill that somewhat resembles the White-winged Crossbill. Hispaniolan Crossbill - Zapotén, Pedernales, Dominican Republic One theory is that a group of White-winged Crossbills remained trapped on Hispaniola near the end of the last ice age. As the temperatures warmed, pine forests retreated further north and the only pines that could survive in Hispaniola were these high elevation ones, now called the Hispaniolan Pine. In the thousands of years since, this resident population of crossbills remained and they are distinct enough to be considered their own species - the Hispaniolan Crossbill. It was really neat to spend a few minutes with this female Hispaniolan Crossbill and to observe its unique bill shape and listen to its distinctive calls. Hispaniolan Crossbill - Zapotén, Pedernales, Dominican Republic By this point we had found most of our bird targets from the upper elevations, though the Golden Swallow and White-fronted Quail-Dove still eluded us. We started back down the road as we had a few more targets - namely the Hispaniolan Loggerhead Kingbird and Bay-breasted Cuckoo, two of the toughest endemics on the island. Naranjos area, Independencia, Dominican Republic Beginning around 1000 m in elevation, we made frequent stops to play tapes for both of our target species. Our first handful of stops produced no hits, though we found our first Olive-throated Parakeets of the trip as well as a nice selection of butterflies. Trawling for cuckoos - Naranjos area, Independencia, Dominican Republic Olive-throated Parakeet - Naranjos area, Independencia, Dominican Republic Cloudless Sulphur (Phoebis sennae) - Naranjos area, Independencia, Dominican Republic Anasaitis locuples - Naranjos area, Independencia, Dominican Republic Banded Yellow (Eurema elathea) - Naranjos area, Independencia, Dominican Republic Finally, we lucked out with a Hispaniolan Loggerhead Kingbird that responded to the tape. It remained out of sight, though. I had read that this species is quite tape-responsive; perhaps this is only the case during the breeding season. Hispaniolan Violet Dung-Rolling Beetle (Canthon violaceus) - Naranjos area, Independencia, Dominican Republic One of our last stops produced a vocal Bay-breasted Cuckoo as well! It was also uncooperative, but we would have redemption at our final stop before reaching the first army checkpoint. We heard a pair of Bay-breasted Cuckoos vocalizing from somewhere off the road. I decided to enter the forest and, after following the sounds of the cuckoo, I found it perched just above eye-level. Luckily it stayed long enough for Dan and Laura to bask in its glory. Such an awesome bird! Bay-breasted Cuckoo - Naranjos area, Independencia, Dominican Republic With most of our targets in the bag, Rafael drove us back to Villa Barrancoli. But we made one final stop in some agricultural fields and quickly found a pair of Antillean Siskins, yet another endemic species down! Antillean Siskin - Puerto Escondido, Independencia, Dominican Republic We thanked Rafael profusely for such an excellent day. If anyone is planning a Zapotén expedition through Kate Wallace, ask for Rafael - you won't be disappointed.
I have recently returned from an eight-day blitz of the Dominican Republic with my wife, Laura, and good friend, Daniel Riley. Now October isn't really an ideal time for a birding trip to the Dominican Republic for a few reasons. First, October is the off-season and few birds are breeding. This means that bird song is relatively quiet and playback doesn't work very well since most species couldn't be bothered with the idea of defending a territory. Second, October is one of the hottest months of the year, especially compared to January or February which is when most birders visit the country. This makes birding in the lowlands that much more uncomfortable, especially for us Canadians who are used to the cold. And third, October is well within the window for hurricane season. Though the 2025 hurricane season had been relatively quiet prior to our trip, this would change halfway through and would cause us to change our itinerary. More on that later! That being said, we still had an amazing trip and found almost everything that we hoped to. The birds did not give themselves up easily, but we persisted and prevailed with almost every species. And the herping was phenomenal with many snakes, lizards, and frogs. Certainly, the rainier conditions assisted us in this regard. The mothing was also fantastic. As birds are only one of our interests, missing a couple of bird species in exchange for better herping and mothing conditions seemed to be a reasonable trade-off. Ashy-faced Owl - Caño Hondo, Hato Mayor, Dominican Republic October 18, 2025 One of the reasons why we picked the Dominican Republic in the first place is because of how easy it is to visit from Canada. Each day, there are multiple direct flights from Toronto and this was important as we only had an eight-day window to complete our trip. Laura's work rotation has a suitable gap, and so this was an opportunity for us to get away on a trip without her having to use any vacation time. Our flight arrived on time and we quickly sorted out the rental vehicle through Enterprise at the airport. By 3 PM we were on the road, heading north along the coast towards the town of Sabana de la Mar and Parque Nacional Los Haitises. We had added our first lifers while procuring the rental car, species that would prove to be common throughout our week in the DR: Hispaniolan Woodpecker was a lifer for Laura and I, while Antillean Palm-Swift was a new one for just Laura. Dan had been to a resort in the Dominican Republic previously and so he had already seen some of the common bird species. The drive was uneventful and we kept a close eye on the clock as we slowly made our way through coastal towns with their innumerable speed bumps. The high clearance SUV was necessary for the speed bumps alone! By 5:30 PM we arrived at Paraíso Caño Hondo, our hotel at the edge of the national park. Unfortunately the drive had taken too long to manage much birding before dark, and so our number one target species, the Ridgway's Hawk, would have to wait until the following morning. Still, it was exciting to walk around at dusk and see new species, such as Bark Anole (Anolis distichus) and a neat mantis called Gonatista major. Bark Anole (Anolis distichus) - Caño Hondo, Hato Mayor, Dominican Republic Gonatista major - Caño Hondo, Hato Mayor, Dominican Republic We checked into the hotel, set up the moth sheet, and went for a quick stroll around the property to familiarize ourselves with the area and to figure out where we needed to hike the following morning to search for the Ridgway's Hawk. Yellow Split-Toed Frogs (Eleutherodactylus flavescens) and Common Stout Anoles (Anolis hispaniolae) were quickly discovered. Both of these species are endemic to the island of Hispaniola. We also found our first of many tarantulas. This is one of the species in Phormictopus, a genus which is limited to Cuba and Hispaniola. Phormictopus sp. - Caño Hondo, Hato Mayor, Dominican Republic Yellow Split-toed Frog (Eleutherodactylus flavescens) - Caño Hondo, Hato Mayor, Dominican Republic Common Stout Anole (Anolis hispaniolae) - Caño Hondo, Hato Mayor, Dominican Republic The vast majority of the plant life was unfamiliar to us as well. I snapped a few photos, mainly of ferns that were growing along an embankment. Pyramid Maidenhair (Adiantum pyramidale) - Caño Hondo, Hato Mayor, Dominican Republic Fragile Maidenhair (Adiantum pyramidale) - Caño Hondo, Hato Mayor, Dominican Republic Tropical Resurrection Fern (Pleopeltis polypodioides) - Caño Hondo, Hato Mayor, Dominican Republic We wolfed down the hotel's buffet dinner (our first real food since breakfast) before procuring our gear for our first proper birding of the trip, a spotlighting session for Ashy-faced Owl. This species is closely related to the familiar and cosmopolitan Barn Owl, though it is restricted to the island of Hispaniola. Ashy-faced Owls are not particularly rare or range-restricted, but we hoped to find one here since the owling conditions were good this evening and a healthy population of owls resides in this area. If we struck out tonight, we would have to devote valuable evening or early morning hours later in the trip; hours better spent looking for boas, for example. Armed with flashlights, headlights and a thermal camera we headed out by car along the entrance road, making various stops to hunt for our target. The thermal camera picked up numerous heat signatures. Black Rats were the default culprits, though we also located a Black-whiskered Vireo, Limpkin and Bananaquit in this manner. Black Rats are introduced on Hispaniola and the population here sure seems to be quite healthy. I wonder if the Ashy-faced Owls are taking advantage of this relatively new food item on the menu. Black Rat (Rattus rattus) - Caño Hondo, Hato Mayor, Dominican Republic Finally, after over an hour of searching, we heard the characteristic hissing shriek of an Ashy-faced Owl. Success! Seeing them would prove difficult, but eventually a couple of dark shapes glided over the road, sihouetted by the moonlight. Our spotlight illuminated the pair of Ashy-faced Owls. Ashy-faced Owls - Caño Hondo, Hato Mayor, Dominican Republic We couldn't have asked for better looks of this handsome owl species and we took a few photos of them lit up by the spotlight beam. Owling can be difficult, even with the assistance of a thermal camera, and any victory is one to be celebrated. Happy with our excursion, we returned to the hotel. Ashy-faced Owls - Caño Hondo, Hato Mayor, Dominican Republic Though we were all pretty tired due to the early wake-up required to make our morning flight, we still had one task to complete before our beds beckoned. Mothing! (moths) It was obvious to us that this corner of Hispaniola had received a fair bit of rainfall recently as the vegetation was lush and the streams were flowing quickly. In our experience, increased rainfall has a positive correlation with diversity on the moth sheet. This evening was another data point in that favour as the sheet was dripping with moths. If only we had more time to stay out later, as many new moths were appearing even as we were taking the sheet down. But we needed some rest before the Ridgway's Hawk search began, and that took priority. October 19, 2025 Sunrise at this time of year arrives late, yet by 6 AM all three of us were geared up and raring to go birding. We sipped a coffee at the hotel while the sky slowly lightened and the morning's first birds called out from the darkness: Bananaquits, Palmchats and Hispanoiolan Woodpeckers. Finally, by 6:30 AM it was light enough to see the birds. Palmchat - Caño Hondo, Hato Mayor, Dominican Republic The Ridgway's Hawk is a species of Buteo that is most closely related to the Red-shouldered Hawk of Canada, the United States and Mexico. While formerly widespread across Hispaniola, this species has experienced a steady decline brought on by two strong factors: habitat loss (deforestation), and direct persecution by humans. When the hawks are hanging around homesteads and farms with chickens, they are often shot. The truth is that a fully-grown chicken is much too large a meal for a Ridgway's Hawk and these diminutive hawks primarily subsist on lizards, snakes and introduced rodents, but the unfair stigma has contributed to their decline. To make things worse, a botfly parasite has been found infecting Ridgway's Hawk chicks, causing reproductive rates to be barely sustainable to begin with. Only a few hundred Ridgway's Hawks survive in the wild with the population stronghold being Parque Nacional Los Haitises. In recent years, the Peregrine Fund has helped establish two introduced populations. One is thriving in the Punta Cana area, while the other has been recently set up in Los Brazos. Sunrise at Caño Hondo, Hato Mayor, Dominican Republic The vast majority of birders who cross paths with Ridgway's Hawks either do around the resorts in Punta Cana, or they visit the Caño Hondo area at the edge of P. N. Los Haitises. We were more interested in seeing the "wild" birds, which is why we added a night here at the start of our trip. We set off on a wide trail near the hotel complex which accessed the mosaic of woodland and pasture home to a pair of Ridgway's Hawks. Searching for Ridgway's Hawks - Caño Hondo, Hato Mayor, Dominican Republic Early on our search was unsuccessful, but the birding was exciting nonetheless. After all, we were in a novel environment and many of the species were new and interesting to us. Western Cattle-Egret - Caño Hondo, Hato Mayor, Dominican Republic Some were familiar to us - the Western Cattle-Egrets working the fields and the Gray Kingbirds twittering from dead snags, for example. Gray Kingbird - Caño Hondo, Hato Mayor, Dominican Republic Others, such as the Plain Pigeons that flew overhead all morning, were new for Laura and Dan. I had seen this species previously in Cuba, but it was nice to be reacquainted with them. Plain Pigeon - Caño Hondo, Hato Mayor, Dominican Republic Laura picked out a Hispaniolan Pewee, a lifer for all three of us. Drab flycatchers are not at all her favourite (who can blame her?) and so I was quite proud of her correct identification of the pewee! We were feeling anxious as the minutes ticked by and the sun rose higher in the sky. We had only budgeted one night here, and if we missed the Ridgway's Hawk this morning then it would be impractical to change our itinerary to spend an extra night. But Dan came through. His scanning of a distant hillside produced a curious small hawk sitting in a cecropia. Indeed, it was our first Ridgway's Hawk! Ridgway's Hawk in Trumpetwood (Cecropia schreberiana) - Caño Hondo, Hato Mayor, Dominican Republic Here is a slightly closer photo of the same bird. Though the views were a little bit distant, we were thrilled to see such a rare species. We heard a second Ridgway's Hawk vocalizing from the edge of a pasture and headed over there for a peek, but it vanished. As did the original one before we could approach for a closer view. That was all we were going to get from the birding gods, but our Ridgway's Hawk experience was much better than nothing. Ridgway's Hawk - Caño Hondo, Hato Mayor, Dominican Republic We all had more spring in our step as we headed back to the hotel for a well-deserved breakfast. Many other birds came out of the woodwork - Louisiana Waterthrushes along the creek, Yellow-faced Grassquits buzzing from the grasses, and White-winged Doves feeding on a fruiting tree. Louisiana Waterthrush - Caño Hondo, Hato Mayor, Dominican Republic Yellow-faced Grassquit - Caño Hondo, Hato Mayor, Dominican Republic White-winged Dove - Caño Hondo, Hato Mayor, Dominican Republic I even stopped to take a photo of one of the ubiquitous Turkey Vultures. It is definitely a bird species that gets better looking the further away it is. Turkey Vulture - Caño Hondo, Hato Mayor, Dominican Republic Another highlight was a group of Caribbean Martins cruising overhead. These birds vacate Hispaniola in October, though small numbers can hang around, and it was one species that could be easily missed on our trip. Caribbean Martin - Caño Hondo, Hato Mayor, Dominican Republic We also saw a few of the common endemic bird species including Hispaniolan Mango, White-necked Crow and Broad-billed Tody. The todies are a well-loved family of birds that only contains five living species, all found in the Greater Antilles. Todies are most closely related to the clade that includes motmots and kingfishers. Laura's favourite bird family is the motmots, so it was no surprise that she was enamoured by her first tody, too. Broad-billed Tody We enjoyed a hearty breakfast, packed up and headed out under blue skies and hot temperatures. We had a long driving day ahead of us but made sure to make a few birding stops along the entrance road to Caño Hondo. This paid off as Dan noticed a few Tricolored Munias feeding on roadside grasses, a life bird for him. This was the first time that Laura and I had seen this adaptable species outside of southeast Asia. Tricolored Munia - Caño Hondo, Hato Mayor, Dominican Republic Tricolored Munia - Caño Hondo, Hato Mayor, Dominican Republic Our time at the edge of Parque Nacional Los Haitises had been brief, but it had been immensely productive. Ashy-faced Owls and Ridgway's Hawks, lifer frogs and lizards, and even a great mothing session. The clock was ticking, and it was now time to drive through Santo Domingo to the southwestern part of the Dominican Republic.
More in science
[Note that this article is a transcript of the video embedded above.] I love the periodic table of the elements. I love it because it reveals the deeper order of what seems like an otherwise wildly disparate collection of atoms with different physical forms, chemical properties, and nuclear stabilities. I love it because, even before we actually found the elements that fit into each box, we knew that something did and could even predict some things about those elements before they were ever discovered. And finally, I love it because it’s a bit messy. Not everything lines up perfectly, and in some ways, it’s still a work in progress. In many ways, human-created standards follow that same form, and I want to try and convince you that they deserve the same affection. Let me present the periodic table of standard North American electrical connections. Isn’t it beautiful? I’m fascinated by stuff like this: a diversity of needs and purposes put into a relatively nice, neat order. But why do we need so many? And where do any of these actually get used? Well, I’ve spent the past month reading just about everything I could find on electrical plugs and receptacles to figure those questions out, and I even have a few of them here so I can show you what I learned. I’m Grady, and this is Practical Engineering. Electricity is something we really don’t want to be proprietary. It’s one thing if your charger doesn’t work on your buddy’s cell phone. It’s another thing entirely when you have to rewire your house because you bought a different brand of toaster. The National Electrical Manufacturers Association, or NEMA, was founded in 1926 as a coalition of companies making electrical equipment. Their members realized that life would be better with some standards, so that any company making an electrical device could be reasonably confident that the people who might want to buy that device would be able to use it, and more importantly, use it safely. This didn’t happen overnight. It took a diverse group of manufacturers, engineers, and testing labs to form a consensus around the system we use today. And it’s far from a perfect system. My friends Mehdi and Alec have covered receptacle-related topics on their channels, including the merits and disadvantages of the NEMA designs. But it works pretty well. Well enough that the NEMA connector standards have been adopted not just in the US, but all of North America, Central America, parts of South America, Japan, Taiwan, the Philippines, and beyond. Here’s that table again. You probably noticed that every type of plug and receptacle has its own special number. They seem a bit arcane at first glance, but it’s actually a handy naming scheme that’s pretty straightforward to understand. The first number is the configuration that defines the combination of voltage rating, wire count, and grounding style. These numbers are a bit arbitrary, but they kind of represent a certain class of receptacles and plugs. For example, NEMA 1 receptacles are rated for 125 volts and have just 2 poles (a hot and neutral) with no ground. The NEMA 1-15 was the classic North American outlet until the 1960s, and you still see these in older buildings. Lots of devices made today can still use them, especially low-voltage equipment like chargers, and, critically, those without external metal parts. If an energized wire inside the device comes loose and contacts the case, there’s still an insulating barrier protecting someone from being shocked. The reason NEMA 1 receptacles are mostly a thing of the past is what could happen when equipment didn’t have that protection. If a device with a metal enclosure or exposed metal parts had an energized wire come loose, that metal would be energized too. But, critically, it might not create a short circuit. With nowhere for current to flow, the device could just sit there, indefinitely dangerous, until someone happened to touch it, allowing current to flow through them to a lower potential. The ground wire we see in nearly all plugs and receptacles today fixes that specific hazard. Bonding exposed conductive elements and connecting them to ground makes sure that if they somehow become energized, current will flow, a short circuit will form, and protective devices like breakers will activate. Today we use the NEMA 5 standard for the vast majority of receptacles and plugs. Even if you’ve never heard of NEMA or seen the other plugs on the periodic table, you’re almost certainly familiar with this design. They have a 125 volt rating to handle the standard 120 volt service for most electrical devices with a little buffer. They have an energized pole, called the hot; a neutral pole to provide a return path, and a separate ground return that is bonded to the neutral line in the main electrical panel. The ground pin on most outlets is round instead of flat, and that’s the reason why nearly all electrical outlets kind of look like they’re screaming. Or at least they do to me. One thing about NEMA 5, and actually most of the NEMA configurations, is that the outlets have polarity. On the NEMA 5-15, the neutral slot is a bit wider than the hot, making it so the plug can only go in one way. In function, polarity often doesn’t matter for AC circuits. Current travels in both directions, so the equipment inside the device can’t really tell the difference. And some devices, like switch-mode power supplies, don’t care which direction they’re plugged in. Both blades are the same size. For safety, though, a lot of devices do. You really don’t want heating elements, motor coils, and circuit boards energized and waiting for a ground. It’s less hazardous to put the switch on the hot wire so that nothing beyond the cord is energized until it’s turned on. Enforcing polarity at the plug prevents “switched neutrals” along with other issues like electrical noise. The NEMA 5-15 plug and outlet were designed to be backward compatible with the older 1-15 standard. 1-15 plugs work just fine in the modern 5-15 outlets, and there are quite a few interesting compatibility cases like that in the NEMA standards. For example, the “15” in 5-15 refers to the current rating. Nearly every household device and appliance that runs on 120 volts is designed so that it never draws more than 15 amps, and actually, if the device is meant to run for more than 3 hours continuously, like a space heater, it can only draw 80% of that (which is 12 amps if you’re keeping score at home). That limit is obviously fine for most household appliances. But, especially in commercial spaces, it’s not quite enough power for certain devices like kitchen mixers, treadmills, copy machines, and power tools. Of course, we could just change the codes to require 20-amp circuits everywhere, but that has huge implications: larger circuit breakers, heavier-gauge wiring, and more expensive receptacles. And in many cases, it’s just not necessary. So instead, NEMA created a different receptacle and plug for 120-volt, 20-amp circuits, the 5-20. I have a bunch of these in the studio. You can see they have that T shape on the neutral slot. And 20-amp devices have the neutral blade rotated 90 degrees on the plug. But here’s the backward compatibility: regular 15-amp plugs fit into the 5-20 receptacle as well. NEMA 5 has 30 and 50 amp receptacles too, although they aren’t used very often these days because of a quirk about the historic availability of voltage. Today, split phase electrical service is basically standard for residential power. You get two 120-volt hot lines which can be used individually for smaller circuits or combined to get 240-volts for circuits that need more oomph. In the early 20th century, 240-volt service wasn’t always available, so you have these very-high-current 120-volt receptacles that could power heavy commercial cleaning equipment like floor burnishers and blowers, kitchen equipment like warming cabinets and steam tables, and large shop tools like table saws and compressors. Also, not all portable generators run at 240-volts, so older models used the larger NEMA 5 receptacles as well. These are still available and installed in places where, for whatever reason, a higher-voltage circuit is hard to come by. But in most cases, the more power-hungry devices are going to run on 240-volts. That brings us to NEMA 2. Like NEMA 1, these are ungrounded receptacles, but instead of a hot and neutral, they have two hots. Each is 180 degrees out of phase with its neighbor, so you get 240-volts across them, handled with a little cushion by the 250-volt rating. There were 20 and 30 amp receptacles, but, also like NEMA 1, these are mostly obsolete now that a ground is required by code. They’ve been replaced with NEMA 6, which has 15, 20, 30, and 50-amp receptacles and plugs. Of course, with double the voltage, you also get double the power compared to the NEMA 5 equivalents at the same current rating. The 6-15 is common for window or wall-mounted air conditioners. The 6-20 is used for heavier-duty air conditioners plus commercial kitchen equipment and shop tools. The 6-30 is used with large heaters, kilns, and heavy power tools. The 6-50 is kind of the standard welder outlet, plus it’s pretty common these days for level 2 EV chargers, capable of delivering nearly 10 kilowatts of continuous power through the receptacle. Like NEMA 5, the NEMA 6 has some backward compatibility, allowing 6-15 plugs to fit into 6-20 receptacles. This is kind of clever, but it doesn’t work all the way up the different current ratings. Of course a 50-amp outlet could easily handle a 15-amp device. And it would certainly be possible to design a series of outlets where each successive jump in current rating allowed those smaller devices to plug in. But there are two main reasons why they don’t: One is practicality. The blades on plugs aren’t all the same thickness. Designing a single receptacle slot that can safely grip both a thin, 15-amp blade and a massive 50-amp one would make manufacturing more difficult and increase the chances of developing loose connections inside the receptacle over time. Two is safety: circuit breakers are sized to protect everything downstream, including the plug and the appliance cord. If a thin cord on a low-current device develops an internal short, the resistance of that thin wire itself will cap the fault current so that a larger breaker might take much longer to trip or not trip at all. That could allow the wire to reach high enough temperatures to start a fire. Of course you don’t want a high-current device plugged into a lower-current-rated circuit, but if you trace out the things that can go wrong, it turns out that you also don’t want lower-current devices plugged into a high-capacity circuit. So, the plugs and outlets are designed to prevent both cases, except for the 15 and 20 amp situation, where the current is close enough that a breaker should still work as intended. 240 volts are useful to supply more power at the same current rating, but of course it comes at a cost. Higher voltage means more potential, literally, for arcs to occur. Equipment designed to handle the higher voltage needs better insulation and more careful design. Take a clothes dryer for example. You want the extra voltage for the power-hungry heating elements, but all the other stuff inside (like timers, controllers, and clocks) can easily run on 120 and those lower-voltage components are more affordable. That’s where NEMA 10 came in. You get three poles: two hots and a neutral. In that way, you get dual voltage: 240 between the hots and 120 between each hot and neutral. Of course, NEMA 10 receptacles also lack a ground connection, so they’re mostly obsolete. Plenty of houses still have them installed for clothes dryers and kitchen ranges, but since the 1990s, they’ve been supplanted with the NEMA 14 configuration. This is the most widely-used 240-volt standard in North America today. It’s versatile, providing both voltages. And there are a full range of current capacities, allowing you to design a circuit that’s well-suited for a device, from 15 all the way up to 60 amps. The 14-15 is pretty rare. I couldn’t even find someone making the receptacle. The 14-20 is also not that common. Some food service equipment uses this like certain coffee makers. The warmers rely on 240 volts while the fans and timers run on 120. Same with some jobsite heaters and specialized laboratory equipment. The 14-30 is the standard residential electric clothes dryer plug and is often used for EV chargers. Some server and mainframe equipment uses it as well. The 14-50 is the standard residential cooking range and oven plug. It’s also widely used for EV chargers and pretty common at RV campgrounds as well. The 14-60 is more of a commercial or industrial receptacle, used for large kitchen appliances and distribution of power at events like concerts. Single phase electrical service covers nearly all residential and lots of commercial buildings. But, the grid runs on three phases and it’s pretty common for larger commercial buildings and essentially all industrial facilities to have three-phase service. It’s particularly useful for devices that use large motors. And of course, if you have the service, you’re going to need receptacles and plugs for those devices, or at least the ones that aren’t hard-wired. NEMA 11 was the standard for up to 250V with receptacles and plugs ranging from 15 to 50 amps. Those have been replaced by the new NEMA 15, again because of grounding requirements. And this is going to almost always be relatively specialized industrial devices: woodshop and machining tools, laboratory testing equipment, grinders, pumps, dust collectors, heavy welders, plasma cutters, and so on. It’s not stuff most people see in everyday life, and in many cases, each receptacle is going to be custom-installed for a specific piece of equipment. And since hard-wiring equipment directly to the service panel is typically the default, that makes receptacles like these even more rare. You really only see them in places that need a high degree of modularity, allowing for rapid reconfiguration of workspaces like jobsites, certain manufacturing facilities, and short life-cycle equipment that needs to be easily swapped out. There are two main three-phase service classes used in most commercial and industrial buildings in the US. The most common is 208 volts phase to phase, which uses the NEMA 15 configuration. There’s also 480 volts phase to phase, but like I mentioned before, you can get a lower voltage between phase and neutral (in this case, 277 volts). So NEMA 7 has plugs and receptacles specifically for using just one phase from buildings wired with 480-volt, three-phase service. A lot of commercial and industrial lights use these receptacles, like warehouses, factories, and arenas, making them easy to swap out without hard-wiring. Commercial ventilation and air conditioning systems use them too. And just like the dual-voltage 240-volt plugs, there are also dual-voltage three-phase plugs, delivering equipment with all three hot phases plus a neutral so different components can run at different voltages. NEMA 18 has receptacles for 208-volt service, although they don’t have a ground, so they’re mostly obsolete. There are no straight-blade plugs that have replaced NEMA 18. Aligning and inserting a 5-blade plug would be tricky and take a lot of force. And I’ve kind of buried the lede here only talking about the straight-blade NEMA standards. The reality is that a large number of the NEMA receptacles and plugs have an equivalent locking version. These use curved blades that twist inside the receptacle so they can’t be easily pulled out. Actually the locking versions are more common than the straight-blade equivalents in many cases, especially when it comes to portable generators, jobsite equipment, and events where things are always moving around. If your vacuum cleaner unplugs itself because you’ve gone too far into the hallway, that’s usually not a big deal, but if a three-phase 600 volt plasma cutter does the same thing, you can get serious damage from arcing. That’s why the locking standards extend beyond the voltage ratings of the straight-blade ones up to three-phase 600-volt circuits. They even have receptacles for 400-hertz power used in aerospace, submarine, and military systems. Of course, sometimes the standards make themselves. When it comes to RVs and travel trailers, (from what I can gather) the industry had already developed a 120-volt, 30-amp receptacle before NEMA formalized its catalogue of standards. Instead of forcing an entire industry to retool, NEMA just adopted what everyone was already using, calling it the TT-30. TT for travel trailer and 30 for the current capacity. In function, it’s not any different than the NEMA 5-30 receptacle and plug, but you’ll almost never see one of those, because the TT-30 is far more common. It’s a face only an outlet enthusiast could love. I haven’t really talked about the smaller versions of the locking connectors used where space is an issue. And there are even more specialized standards like ship-to-shore power, aircraft, and military uses. Of course, when you look beyond NEMA, there are way more standards out there. But I feel like this is enough to get you excited about the weird, wide world of electrical receptacle standardization. There are all kinds of practical considerations that make it much more complicated than just a 2D chart with voltage on one side and current on the other. Just like the periodic table of the elements, the NEMA connection standards are a bit messy. And that’s what I love about them.
The course of history is affected by many things, including the political and social situations of large groups of people, […]
Rethinking the electric field Have you ever wondered what an electric field actually is? The electric field is the foundation of most technologies that we rely on every day. From power grids and electronic devices to radio communication and the … Continue reading →
We are less than one month away from the end of the federal fiscal year, and traditionally there are internal deadlines for agencies to allocate their final spending by around September 9. Right now, the NSF is on track to issue about 4000 fewer (!!) awards in FY26 than it did annually back in FY21-FY24, and 2000 fewer than it did in the incredibly tumultuous FY25 (with its government shutdowns and mass cutbacks in agency personnel). This is dire, if like me you are a supporter of the agency and its vital role in the US research ecosystem. Perhaps even more distressing, the NSF is on track to underspend its FY26 budget appropriation (congressionally approved, presidentially signed) by between $1.25-1.5B, or 15-18%. This is essentially unprecedented - in the past, the NSF has always spent ~ 99% of its appropriation in a given fiscal year. Some large portion of this is from the mid-FY clawbacks that were reported in Science and Nature, supposedly squirreled away to support an as-yet unannounced OSTP "grand challenges" program. While technically the funds don't go away at the end of September, this kind of underspending raises the possibility of a pocket rescission. OMB and the executive branch have been pushing for massive cuts to the agency; Congress has disagreed. It sure looks like all the "see, don't worry, Congress didn't allow big cuts to the NSF" palliative statements don't hold up very well to scrutiny, if the majority party is content to just give up Article I power to the executive branch. In this period of complete flood-the-zone craziness, the mainstream news media seemingly doesn't have the bandwidth or interest to report on this; they seem to have judged that it's too obscure, it doesn't play in Peoria, the public doesn't really care. This kind of disruption will have ripple effects that last for many years and affect US scientific and economic competitiveness, and it's happening without much notice. This week's news about an agreement between NIH and DOD to funnel NIH funds for infectious disease to DOD (or, in the official statement, to work together on projects of mutual interest), is at least getting some public attention. Agencies agreeing to pass around at minimum hundreds of millions of dollars outside congressional oversight or what the appropriations acts say is another example of an Article I crisis, when the majority party basically hands over what are supposed to be congressional powers to executive branch. (An additional sciencey blog post coming soon!)
I am working on a new book called You Would Choose Now: Measuring America’s Progress Toward Fairness and Tolerance. It’s a data-driven exploration of progress (or not) in public opinion and civil rights. I posted the first two chapters as an Early Access edition on LeanPub (a platform for posting work in progress like this): https://leanpub.com/ywcn If you would like to check it out, the “Free Sample” has just the first chapter. If you sign up with an email address,... Read More Read More The post New Book! appeared first on Probably Overthinking It.