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Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird of the Americas that feeds on crustacea, Bermuda, Atlantic

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Adult male spruce (Franklin's) grouse (Falcipennis canadensis) near Brooks River, Katmai National Park, Alaska, United States of America

An adult ivory gull (Pagophila eburnea) on ice near Monaco Glacier on the north side of SpitsBergen, Vestland, Norway

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult black-browed albatross (Thalassarche melanophrys), close up of tail at nesting site on New Island, Falklands, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Striated caracara (Phalcoboenus australis) feather detail, on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Close up of king penguin's (Aptenodytes patagonicus) downy plumage (okum boy) on South Georgia Island, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguin (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Adult rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Northern shoveler (Anas clypeata) male landing on a frozen pond in the winter, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Lilac-breasted roller (Coracias caudata) with an insect, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Antarctic shag (Leucocarbo bransfieldensis) in breeding plumage, Barrientos Island, Antarctica, Polar Regions

Adult female Magellan goose (upland goose) (Chloephaga picta), on New Island in the Falkland Islands, South Atlantic Ocean, South America

Capped Heron (Pilherodius pileatus) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Adult dovekies (Little Auk) (Alle alle) at their breeding site amongst scree slopes at Rubini Rock, Tikhaya Bay, Hooker Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Northern fulmar (Fulmarus glacialis glacialis) on the wing over calm seas in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Jungle myna (Acridotheres fuscus), looking for water at the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Young northern gannet (Morus bassanus) in flight near Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Imperial Shags (Phalacrocorax (atriceps) atriceps) at breeding colony on small islets off the city of Ushuaia, Argentina, South America

Adult great blue heron (Ardea herodias cognata) at Cerro Dragon on Santa Cruz Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, Sputh America

Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Antarctic tern (Sterna vittata) in brash ice near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boy) on South Georgia Island, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Brown booby (Sula leucogaster), in flight off small islet north of Isla San Marcos, Baja California Sur, Sea of Cortez, Mexico, North America

Adult azure kingfisher (Ceyx azureus), perched in Porosus Creek, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific

Common ostrich (Struthio camelus) chick, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Beautiful sunbird (Cinnyris pulchella), male, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Adult king penguin (Aptenodytes patagonicus) amongst chicks at breeding colony at Gold Harbour, South Georgia Island, Polar Regions

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Snow goose (Chen caerulescens) landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Sandhill crane (Grus Canadensis) in flight parachuting on approach to landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Northern pintail (Anas acuta) male swimming, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Southern ground-hornbill (ground hornbill) (Bucorvus leadbeateri), male, Kruger National Park, South Africa, Africa

Rupellss griffon vulture (Gyps rueppellii), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Black-headed gull Chroicocephalus ridibundus), summer plumage, hovering over flowering cotton grass, Finland, Europe

King penguin (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Osprey (Pandion haliaetus), in flight to its nest, Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

Snow goose (Chen caerulescens) in flight, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Black-faced sandgrouse (Pterocles decoratus), male, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Yellow-billed storks (Mycteria ibis), in breeding plumage on riverbank, Kruger National Park, South Africa, Africa

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Heermann's gull (Larus heermanni), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North Anerica

Male hooded merganser (Lophodytes cucullatus) in breeding plumage, Rio Grande Zoo, Albuquerque Biological Park, Albuquerque, New Mexico, United States of America, North America

Australasian darter bird (Anhinga novaehollandiae) drying wings, snake bird spreading wings, Poovar Island, Kerala, India, Asia

Adult brown pelican (Pelecanus occidentalis), taking flight on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

Beautiful sunbird (Cinnyris pulchella), female, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Western gull (Larus occidentalis), in non-breeding adult plumage, Monterey Bay, Monterey, California, United States of America, North America

Adult brown pelican (Pelecanus occidentalis), in flight, Isla Carmen, Baja California Sur, Mexico, North America

Two sandhill crane (Grus Canadensis) in the snow, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Lilac-breasted roller (Coracias caudata), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Marabou stork (Leptoptilos crumeniferus), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Adult brown pelicans (Pelecanus occidentalis), on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

Yellow-footed gull (Larus livens), on its nest on Isla San Esteban, Baja California, Sea of Cortez, Mexico, North America

Adult brown pelican (Pelecanus occidentalis), on a small islet near Isla Salsipuedes, Baja California, Mexico, North America

White-crowned sparrow (Zonotrichia leucophrys), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Two snow goose (Chen caerulescens) landing, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

A wild adult male bee hummingbird (Mellisuga helenae), attracted to hand-held flower near Playa Larga, Cuba, West Indies, Caribbean, Central America

Brown pelicans (Pelecanus occidentalis) in breeding plumage at Isla Rasita, Baja California, Mexico, North America