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American Tree Sparrow (Spizella arborea), Yellowstone National Park, Wyoming, United States of America, North America

Adult turkey vulture (Cathartes aura) in flight over Saunders Island, Falkland Islands, South America

Cattle egrets (Bubulcus ibis), roosting in a tree in Tarangire National Park, Tanzania, East Africa, Africa

A red-and-yellow barbet (Trachyphonus erythrocephalus) on a termite mound, Tsavo, Kenya, East Africa, Africa

Tufted puffin (Fratercula cirrhata) in flight over the sea, with catch, Sitka Sound, Sitka, Southeast Alaska, United States of America, North America

Portrait of a waved albatross (Diomedea irrorata) sitting on nest, Espanola Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

White-backed vultures (Gyps africanus) and marabou stork (Leptoptilos crumeniferus), Ndutu, Serengeti, Tanzania, East Africa, Africa

Brown pelican (Pelecanus occidentalis), Puerto Ayora, Santa Cruz (Indefatigable) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii), Punta Pitt, San Cristobal (Chatham) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

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

King penguin (Aptenodytes patagonicus) chicks called Okum Boys at Gold Harbor, South Georgia, Polar Regions

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

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

Adult bottlenose dolphin (Tursiops truncatus), leaping to the sky, Isla San Pedro Martir, Baja California, Mexico, North America

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

Rare James's flamingo (Phoenicoparrus jamesi), in flight, Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Rare James's flamingos (Phoenicoparrus jamesi), Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Flamingos taking flight in the hundreds to feed, Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

A pair of adult yellow-crowned night herons (Nyctanassa violacea), Puerto Egas, Santiago Island, Galapagos, Ecuador, South America

A gentoo penguin (Pygoscelis papua) breeding colony on Pleneau Island in early season, Antarctica, Polar Regions

An adult brown skua (Stercorarius antarcticus), harassing a gentoo penguin on Barrientos Island, Antarctica, Polar Regions

A pair of adult southern fulmars (Fulmarus glacialoides), on nest at Peter I Island in the Bellingshausen Sea, Antarctica, Polar Regions

Adult Adelie penguins (Pygoscelis adeliae), walking along a glacier, Thule Island, South Sandwich Islands, South Atlantic, Polar Regions

A waterfall drops to the beach where elephant seals are hauled out on Annenkov Island, South Georgia, South Atlantic, Polar Regions

King penguins (Aptenodytes patagonicus) preening themselves at Salisbury Plain, South Georgia, South Atlantic, Polar Regions

King penguins (Aptenodytes patagonicus) preening themselves at Salisbury Plain, South Georgia, South Atlantic, Polar Regions

Black-browed albatross (Thalassarche melanophris), chick at breeding colony on Saunders Island, Falklands, South America

Adult imperial shag (Leucocarbo atriceps), in flight at a breeding colony on Saunders Island, Falklands, South America

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

Adult emu (Dramaius novaehollandiae), in the bush at Cape Range National Park, Western Australia, Australia, Pacific

A pair of American flamingo (Phoenicopterus ruber) feeding on artesmia shrimp, Rabida Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult American flamingo (Phoenicopterus ruber) feeding on artesmia shrimp, Rabida Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Ruddy Turnstone (Arenaria Interpres), a small cosmopolitan wading bird, Bermuda, Atlantic, North America

Brazilian merganser (Mergus octosetaceus) swimming in a river, Serra da Canastra National Park, Minas Gerais, Brazil, South America

White Tailed Tropicbird (Phaethon lepturus), a seabird known as the Longtail, found in the Pacific, Atlantic and Indian Oceans, Bermda, North Atlantic, North America

View of jetty through swampy marsh at Ghost Mountain Inn at sunrise, Mkuze, KwaZulu-Natal Province, South Africa, Africa

Black-headed gull (Chroicocephalus ridibundus) on the edge of Lusiai Lake at Paluse, Aukstaitija National Park, Lithuania, Europe

Greater flamingos (Phoenicopterus roseus) feeding at Lake Ndutu, Ndutu Conservation Area, Serengeti, Tanzania, East Africa, Africa

Redbilled oxpecker (Buphagus erythrorhyncus) on impala (Aepyceros melampus), Kruger National Park, South Africa, Africa

Atlantic puffins (Fratercula arctica) take flight from a cliff-top, Inner Farne, Farne Islands, Northumberland, England, United Kingdom, Europe

Adult Imperial shags (Phalacrocorax atriceps) at breeding colony on small islets just outside Ushuaia, Beagle Channel, Argentina, South America

An adult tricolored heron (Egretta tricolor), head detail, San Jose del Cabo, Baja California Sur, Mexico, North America

World's largest colony of Frigate Birds (Fregata magnificens) in the lagoon, Barbuda, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

Adult blue-and-yellow macaw (Ara ararauna), Amazon National Park, Upper Amazon River Basin, Loreto, Peru, South America

Quan Am Bo Tat temple, Buddhist ceremony of releasing birds back into the wild to help an individual accrue merit, Vung Tau, Vietnam, Indochina, Southeast Asia, Asia

View from Convento de Santa Cruz de la Popa of Cartagena at sunset, Cartagena, Bolivar Department, Colombia, South America

Ruppell's griffon vulture (Gyps rueppellii) on final approach, Serengeti National Park, Tanzania, East Africa, Africa

Red-and-green Macaws (Ara chloropterus) flying over rain forest, Manu National Park, Peruvian Amazon, Peru, South America

Sandhill crane (Grus canadensis) in flight, Bosque Del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Great Gray Owl (Great Grey Owl) (Strix nebulosa) female and 13-day-old chick, Yellowstone National Park, Wyoming, United States of America, North America

White-headed buffalo-weaver (Dinemellia dinemelli), Serengeti National Park, Tanzania, East Africa, Africa

Juvenile pale chanting goshawk (Melierax canorus), Kgalagadi Transfrontier Park, encompasing the former Kalahari Gemsbok National Park, South Africa, Africa

Anhinga (anhinga anhinga) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Cape sugarbird (Promerops cafer), perched on protea, Harold Porter Botanical Gardens, Western Cape, South Africa, Africa

Celtic Monastery, Skellig Michael, UNESCO World Heritage Site, County Kerry, Munster, Republic of Ireland, Europe

Adult black guillemot (Cepphus grylle) at breeding site on Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Black-legged Kittiwakes (Rissa tridactyla) flying and nesting, Diskobukta, Edgeoya Island, Svalbard Archipelago, Norway, Arctic

Magnificent frigatebird chicks (Fregata magnificens) with parents, Isla del Espiritu Santo, Baja California Sur, Mexico, North America

A n adult male polar bear (Ursus maritimus) sitting in a daybed in the snow on Indre Norskoya, Svalbard, Norway, Europe

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

A lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica, Polar Regions

Gentoo penguin colony (Pygoscelis papua) in front of a recently collapsed glacier, Damoy Point, Wiencke Island, Antarctica, Polar Regions

A pair of adult little green bee-eaters (Merops orientalis), perched on a tree, Wilpattu National Park, Sri Lanka, Asia

Adult Brunnich's guillemots (Uria lomvia) nesting on narrow ledges at Alkefjelet, Cape Fanshawe, Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe

Lewis's woodpecker (Melanerpes lewis), Okanogan County, Washington, United States of America, North America

Crimson-breasted boubou (crimson-breasted shrike) (Laniarius atrococcieneus), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa