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Bull California sea lion (Zalophus californianus), on the beach in Puerto Refugio, Baja California, Sea of Cortez, Mexico, North America

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

Gannets (Morus bassanus) at sunset squabbling over territory on Bempton Cliffs, Yorkshire, England, United Kingdom, Europe

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

King penguin (Aptenodytes patagonicus) chick peering out between several adults, Volunteer Point, Falkland Islands, South America

Male upland goose (Chloephaga picta) in flight in front of a penguin colony at Volunteer Point, Falkland Islands, South America

Male upland goose (Chloephaga picta) standing in grassland at Volunteer Point, Falkland Islands, South America

Juvenile Austral thrush (Turdus falcklandii) of the subspecies Falkland thrush (Turdus falcklandii falcklandii), Falkand Islands, South America

Adult snowy egret (Egretta thula) with reddish egret in tidal estuary, San Jose del Cabo, Baja California Sur, Mexico, North America

Black winged stilt wading in the shallow wetland waters at the edge of Chilika Lake, Orissa, India, Asia

Reintroduced common crane (Eurasian crane) (Grus grus) panting in hot weather while standing on her nest in a sedge marsh, Gloucestershire, England, United Kingdom, Europe

Immature Southern Pale Chanting Goshawk (Melierax canorus) bathing after rain, Kgalagadi Transfrontier Park, South Africa, Africa

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

Grey heron (Ardea cinerea) hunting in a marshland pool, Gloucestershire, England, United Kingdom, Europe

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

White morph of the Pacific reef heron (Egretta sacra), Mitchell River National Park, Kimberley, Western Australia, Australia, Pacific

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

An adult great horned owl (Bubo virginianus), with chick sitting on a nest in Madera Canyon, southern Arizona, Arizona, United States of America, North America

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

Close-up portrait of an eastern yellow-billed hornbill (Tockus flavirostris), Khwai Concession, Okavango Delta, Botswana, Africa

An adult female cream-colored woodpecker (Celeus flavus), Lake Clavero, Amazon Basin, Loreto, Peru, South America

Black-capped Donacobius (Donacobius atricapilla) in vegetation, Pantanal, Mato Grosso State, Brazil, South America

Portrait of a common zebra (Equus quagga), walking with a northern carmine bee-eater (Merops rubicus) on its back, Kenya, East Africa, Africa

Intermediate egret at dusk, feeding in the shallow waters at the edge of Cilika Lake, Odisha, India, Asia

Tufted puffin (Fratercula cirrhata) on the sea, wings stretched with catch, Sitka Sound, Sitka, Southeast Alaska, United States of America, North America

Rare leucistic gentoo penguin (Pygoscelis papua), Gonzalez Videla Station, Waterboat Point, Paradise Bay, Antarctica, Polar Regions

Brown skua (Catharacta antarctica) sitting on snow, Neko Harbour, Anvord Bay, Antarctic Peninsula, Antarctica, Polar Regions

Atlantic puffin (Fratercula arctica), Sumburgh Head, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe

Barnacle geese, Branta leucopsis, in flight, Caerlaverock WWT reserve, Dumfries and Galloway, Scotland, United Kingdom, Europe

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

Grey trembler (Cinclocerthia gutturalis), Marigot Bay, Castries, St. Lucia, Windward Islands, Lesser Antilles, West Indies, Caribbean, Central America

Vultures wait to steal eggs as Olive Ridley turtle digs nest at this refuge, Ostional, Nicoya Peninsula, Guanacaste, Costa Rica, Central America

An adult pied kingfisher (Ceryle rudis), taking flight in South Luangwa National Park, Zambia, Africa

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

Adult little bee-eaters (Merops pusillus), near the Luangwa River in South Luangwa National Park, Zambia, Africa

Woolly-necked stork (Ciconia episcopus), Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

An adult African fish eagle (Haliaeetus vocifer), perched at sunset on the shores of Lake Kariba, Zimbabwe, Africa

Adult goliath heron (Ardea goliath), taking flight on the shoreline of Lake Kariba, Zimbabwe, Africa

Adult hippopotamuses (Hippopotamus amphibius), near Mana Pools on the Lower Zambezi River, Zimbabwe, Africa

Captive red-breasted toucan (Ramphastos dicolorus), Parque das Aves, Foz do Iguacu, Parana State, Brazil, South America

King penguin (Aptenodytes patagonicus) adults returning to sea for feeding in Gold Harbor, South Georgia, Polar Regions

A huge King Penguin (Aptenodytes patagonicus) breeding colony on the beaches of Gold Harbor, South Georgia, Polar Regions

Adult wandering albatross (Diomedea exulans) in flight near Prion Island, Bay of Isles, South Georgia, Polar Regions

Wandering albatross (Diomedea exulans) on nest site on Prion Island, Bay of Isles, South Georgia, Polar Regions

A pod of Type A killer whales (Orcinus orca), surfacing off the northwest coast of South Georgia, Polar Regions

Ruppell's vultures (Gyps rueppelli), on the carcass of a plains zebra in Serengeti National Park, Tanzania, East Africa, Africa

Antarctic shags (Leucocarbo bransfieldensis), taking flight with nesting material at Port Lockroy, Antarctica, Polar Regions

Tufted puffin (Fratercula cirrhata) taking flight at South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Tufted puffin (Fratercula cirrhata), breeding colony at South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Chinstrap penguin (Pygoscelis antarcticus), on eggs at Coronation Island, South Orkney Islands, Antarctica, Polar Regions

An adult northern fulmar (Fulmarus glacialis), taking flight off the east coast of Greenland, Polar Regions

View of restaurant overlooking Old Port Beach, Mykonos Town, Mykonos, Cyclades Islands, Greek Islands, Aegean Sea, Greece, Europe

One of 18 species of Darwin's finches, Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

Red-and-green Macaws (Ara chloropterus), Buraco das Araras, Mato Grosso do Sul, Brazil, South America

Adelie penguins (Pygoscelis adeliae), leaping near breeding colony, Heroina Island, Danger Island Group, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), marching on the beach at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Chinstrap penguins (Pygoscelis antarcticus), marching to the sea on Coronation Island, South Orkneys, Antarctica, Polar Regions

Adult snowy sheathbill (Chionis albus), courtship display on Barrientos Island, Aitcho Island Group, Antarctica, Polar Regions

Chinstrap penguins (Pygoscelis antarcticus), and Adelie penguins on Saunders Island, South Sandwich Islands, South Atlantic, Polar Regions

King penguin (Aptenodytes patagonicus), oakum boys at breeding colony in Gold Harbour, South Georgia, South Atlantic, Polar Regions

A pair of adult king penguins (Aptenodytes patagonicus), courtship display on Saunders Island, Falklands, South America

Adult Magellanic penguin (Spheniscus magellanicus), being accosted by hungry chicks on New Island, Falklands, South America

Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

Adult Magellanic penguin (Spheniscus magellanicus), being accosted by hungry chicks on New Island, Falklands, South America

Adult wedge-tailed eagle (Aquila audax), in flight in Cape Range National Park, Western Australia, Australia, Pacific

Whitebacked vulture (Gyps africanus) threat display, Zimanga Game Reserve, KwaZulu-Natal, South Africa, Africa

Great Kiskadee (Pitangus sulphuratus), Serra da Canastra National Park, Minas Gerais, Brazil, South America