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Lammergeier (bearded vulture) (Gypaetus barbatus) in flight, Giant's Castle, KwaZulu Natal, South Africa, Africa

An adult male dusky grouse (Dendragapus obscurus), displaying in Yellowstone National Park, Wyoming, United States of America, North America

King penguins (Aptenodytes patagonicus), Volunteer Point, East Falkland, Falkland Islands, South Atlantic, South America

Peacock (Pavo Cristatus), Sequim, Olympic Peninsula, Washington, United States of America, North America

Great Gray Owl (Great Grey Owl) (Strix nebulosa) female and 11-day-old chicks, Yellowstone National Park, Wyoming, United States of America, North America

Medieval bell towers and terracotta roofs in Rab Town, island of Rab, Kvarner region, Croatia, Europe

American Kestrel (Sparrow Hawk) (Falco sparverius) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

An adult Steller's jay (Cyanocitta stelleri) in Rocky Mountain National Park, Colorado, United States of America, North America

An adult striated caracara (Phalcoboenus australis), feeding on a penguin chick on New Island, Falkland Islands, South America

Adult male Xantus's hummingbird (Hylocharis xantusii), Todos Santos, Baja California Sur, Mexico, North America

Adult female magnificent frigatebird (Fregata magnificens), on nest, Isla del Espiritu Santo, Baja California Sur, Mexico, North America

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) returning to the nest site in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension Island, South Atlantic Ocean

Adult black noddy (Anous minutus) breeding site on Boatswain Bird Island just off Ascension island, South Atlantic Ocean

Golden eagle (Aquila chrysaetos), Yellowstone National Park, Wyoming, United States of America, North America

American oystercatcher (Haematopus palliatus), on Isla Espiritu Santo, Baja California Sur, Sea of Cortez, Mexico, North America

Blue-footed booby (Sula nebouxii), in flight near Isla Salsipuedes, Baja California, Sea of Cortez, Mexico, North America

Pied-billed grebe (Podilymbus podiceps), Sweetwater Wetlands, Tucson, Arizona, United States of America, North America

Adult male magnificent frigatebird (Fregata magnificens), San Gabriel Bay, Espiritu Santo Island, Baja California Sur, Mexico, North America

Western grebe (Aechmophorus occidentalis) swimming, Bear River Migratory Bird Refuge, Utah, United States of America, North America

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

A curious adult cape petrel (Daption capense), Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae), breeding colony at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Adult turkey vulture (Cathartes aura), drying its wings at Los Islotes, Baja California Sur, Mexico, North America

Barnacle geese (Branta leucopsis), Loch Gruinart RSPB reserve, Islay, Scotland, United Kingdom, Europe

Purple sandpiper (Calidris maritima), Bamburgh beach, Northumberland, England, United Kingdom, Europe

A flock of migrating sanderlings (Calidris alba) taking flight on Sand Dollar Beach, Baja California Sur, Mexico, North America

Adult Brunnich's guillemots (Uria lomvia) taking flight at Alkefjelet, Cape Fanshawe, Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe

Adult black guillemot (Cepphus grylle) on Sumburgh Head, Mainland Island, Shetland Isles, Scotland, United Kingdom, Europe

Kittiwakes sitting on a huge piece of glacier ice with an expedition boat in the background, Hornsund, Svalbard, Arctic, Norway, Scandinavia, Europe

Adult striated caracara (Phalcoboenus australis), known locally as a Johnny Rook, Carcass Island, Falkland Islands, U.K. Overseas Protectorate

King penguins (Aptenodytes patagonicus) at sunrise, in St. Andrews Bay, South Georgia, Polar Regions

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

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

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

Crowned plover (crowned lapwing) (Vanellus coronatus), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Hooded vulture (Necrosyrtes monachus) with wings spread, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

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

Common ostrich (Struthio camelus) female with two chicks, Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

Blackbacked jackal (Canis mesomelas) with whitebacked vultures (Gyps africanus), Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Antarctic fur seal (Arctocephalus gazella) in front of a colony of long-tailed gentoo penguins (Pygoscelis papua), Gourdin Island, Antarctica, Polar Regions

Tawny eagle (Aquila rapax) on carcass, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa, Africa

Saddle-billed stork (Ephippiorhynchus senegalensis), Moremi Game Reserve, Okavango Delta, Botswana, Africa

Chinstrap (Pygoscelis antarcticus) and Adelie Penguins (Pygoscelis adeliae), Torgersen Island, Antarctic Peninsula, Antarctica, Polar Regions

Magnificent frigate bird (Fregata magnificens), North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult hooked-bill kite (Chondrohierax uncinatus), on the Rio Tres Irmao, Mata Grosso, Pantanal, Brazil, South America

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

Guardabarranco (turquoise-browed motmot), national bird of Nicaragua, in the Biological Reserve, Nosara, Guanacaste, Costa Rica, Central America

An adult saddle-billed stork (Ephippiorhynchus senegalensis), South Luangwa National Park, Zambia, Africa

An adult marabou stork (Leptoptilos crumenifer), perched on the upper Zambezi River, Mosi-oa-Tunya National Park, Zambia, Africa

Pink-backed Pelican (Pelecanus rufescens) Makgadikgadi Pans National Park, Kalahari, Botswana, Africa

King penguins (Aptenodytes patagonicus), at breeding colony in Gold Harbor, South Georgia, Polar Regions

Brown pelicans (Pelecanus occidentalis) at a sardine processing plant, Puerto San Carlos, Baja California Sur, Mexico, North America

Adult Heermann's gull (Larus heermanni), in flight near Isla Rasa, Baja California, Mexico, North America

Glaucous gull (Larus hyperboreus), in flight in Makinson Inlet, Ellesmere Island, Nunavut, Canada, North America

Adelie penguins (Pygoscelis adeliae), walking and tobogganing along the first year ice in Gerlache Strait, Antarctica, Polar Regions