Glenn Bartley/ BIA / Chestnut-breasted Coronet (Boissonneaua matthewsii) hummingbird feeding on flower nectar, Ecuador

Glenn Bartley/ BIA / Green-and-gold Tanager (Tangara schrankii) feeding on flower nectar, Ecuador

Glenn Bartley/ BIA / Chestnut-breasted Coronet (Boissonneaua matthewsii) feeding on flower nectar, Ecuador

Glenn Bartley/ BIA / Chestnut-breasted Coronet (Boissonneaua matthewsii) hummingbirds pair fighting over flower nectar, Ecuador

Glenn Bartley/ BIA / Streamertail (Trochilus polytmus) male feeding on flower nectar, Jamaica

Glenn Bartley/ BIA / Chestnut-bellied Cuckoo (Hyetornis pluvialis) calling, Jamaica

Glenn Bartley/ BIA / Keel-billed Toucan (Ramphastos sulfuratus), Costa Rica

Glenn Bartley/ BIA / Great Curassow (Crax rubra), Costa Rica

Glenn Bartley/ BIA / Black-mandibled Toucan (Ramphastos ambiguus) during rainfall, Costa Rica

Glenn Bartley/ BIA / Blue-winged Mountain-Tanager (Anisognathus somptuosus), Andes, Colombia

Glenn Bartley/ BIA / Patagonian Sierra-Finch (Phrygilus patagonicus) male calling, Andes, Chile

Glenn Bartley/ BIA / Moustached Turca (Pteroptochos megapodius) pair, Andes, Chile

Glenn Bartley/ BIA / Versicolored Barbet (Eubucco versicolor) male, Amazon, Peru

Glenn Bartley/ BIA / Green Violet-ear (Colibri thalassinus) hummingbird, Colombia

Glenn Bartley/ BIA / Golden-breasted Puffleg (Eriocnemis mosquera) feeding on flower nectar, Colombia

Glenn Bartley/ BIA / Glowing Puffleg (Eriocnemis vestitus) hummingbird, Colombia

Glenn Bartley/ BIA / Red-legged Honeycreeper (Cyanerpes cyaneus), Costa Rica

Glenn Bartley/ BIA / Collared Aracari (Pteroglossus torquatus) during rainfall, Costa Rica

Glenn Bartley/ BIA / Blue-gray Tanager (Thraupis episcopus), Costa Rica

Glenn Bartley/ BIA / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Glenn Bartley/ BIA / Black-capped Tanager (Tangara heinei), Colombia

Glenn Bartley/ BIA / Blue-naped Chlorophonia (Chlorophonia cyanea), Colombia

Glenn Bartley/ BIA / Saffron Toucanet (Baillonius bailloni), Atlantic Rainforest, Brazil

Glenn Bartley/ BIA / Gilt-edged Tanager (Tangara cyanoventris), Atlantic Rainforest, Brazil

Glenn Bartley/ BIA / Brassy-breasted Tanager (Tangara desmaresti), Atlantic Rainforest, Brazil

Glenn Bartley/ BIA / Blue Dacnis (Dacnis cayana), Atlantic Rainforest, Brazil

Glenn Bartley/ BIA / Blond-crested Woodpecker (Celeus flavescens), Atlantic Rainforest, Brazil

Glenn Bartley / Eastern Whip-poor-will (Antrostomus vociferus), Ontario, Canada

Glenn Bartley / Acorn Woodpecker (Melanerpes formicivorus), Costa Rica

Glenn Bartley / Many-banded Aracari (Pteroglossus pluricinctus), Ecuador

Glenn Bartley / Turquoise-browed Motmot (Eumomota superciliosa), Costa Rica

Glenn Bartley / Eared Grebe (Podiceps nigricollis), British Columbia, Canada

Glenn Bartley / Hoatzin (Opisthocomus hoazin) pair, Manu National Park, Peru

Glenn Bartley / Limpkin (Aramus guarauna), Manu National Park, Peru

Glenn Bartley / Magnolia Warbler (Setophaga magnolia) singing male, Ontario, Canada

Glenn Bartley / Sword-billed Hummingbird (Ensifera ensifera), Ecuador

Glenn Bartley / American Black Duck (Anas rubripes) female with chicks, Newfoundland, Canada

Glenn Bartley / Barred Owl (Strix varia), Ontario, Canada

Glenn Bartley / Willow Ptarmigan (Lagopus lagopus) male, Manitoba, Canada

Glenn Bartley / Chestnut-mandibled Toucan (Ramphastos swainsonii), Costa Rica

Glenn Bartley / Emerald Toucanet (Aulacorhynchus prasinus), Costa Rica

Glenn Bartley / Green Violet-ear (Colibri thalassinus), Costa Rica

Glenn Bartley / Blue-mantled Thornbill (Chalcostigma stanleyi), Ecuador

Glenn Bartley / Violet-crowned Woodnymph (Thalurania colombica) female feeding on nectar, Costa Rica

Glenn Bartley/ BIA / Chestnut-breasted Coronet (Boissonneaua matthewsii) hummingbird feeding on flower nectar, Ecuador

Glenn Bartley/ BIA / Bearded Helmetcrest (Oxypogon guerinii) hummingbird, Andes, Colombia

Glenn Bartley/ BIA / Ocellated Turkey (Meleagris ocellata) male displaying, Guatemala

Glenn Bartley/ BIA / Mountain Trogon (Trogon mexicanus), Guatemala