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Adult red-billed tropicbird (Phaethon aethereus), in flight near nest at Isla San Pedro Martir, Baja California, Mexico, North America

A pair of adult Galapagos penguins (Spheniscus mendiculus), on the rocks in Urbina Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult black-browed albatross (Thalassarche melanophris), in flight in Lapataya Bay, Tierra del Fuego, Argentina, South America

An adult wandering albatross (Diomedea exulans) in flight near Prion Island, South Georgia, Polar Regions

Adult female ringed kingfisher (Megaceryle torquata), Rio Tres Irmao, Mata Grosso, Pantanal, Brazil, South America

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

Adult black-browed albatross (Thalassarche melanophris), in flight with its own shadow, New Island, Falkland Islands, South America

Adult Adelie penguin (Pygoscelis adeliae), Coronation Island, South Orkney Islands, Antarctica, Polar Regions

Adult Indian paradise flycatcher (Terpsiphone paradisi) perched on a tree in Wilpattu National Park, Sri Lanka, Asia

Adult Wilson's storm petrel (Oceanites oceanicus), surface feeding at Grytviken, South Georgia, Polar Regions

An adult streaked weaver (Ploceus manyar) weaving its nest in grass, Yala National Park, Sri Lanka, Asia

Adult Magellanic penguin (Spheniscus magellanicus) head detail, Gypsy Cove, outside Stanley, Falkland Islands, South America

An adult bald eagle (Haliaeetus leucocephalus) perched on a channel marker outside Seward, Alaska, United States of America, North America

Adult Heermann's gull (Larus heermanni) at nesting site on Isla Rasa, Baja California, Mexico, North America

Adult jabiru stork (Jabiru mycteri), on the ground near Pouso Allegre, Mata Grosso, Pantanal, Brazil, South America

An adult female willow ptarmigan (Lagopus lagopus) in the shrubs in Denali National Park, Alaska, United States of America, North America

An adult bald eagle (Haliaeetus leucocephalus), in the Inian Islands, Southeast Alaska, United States of America, North America

An adult bald eagle (Haliaeetus leucocephalus), in the Inian Islands, Southeast Alaska, United States of America, North America

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

Adult white-tailed eagle (Haliaeetus albicilla), in flight amongst gulls at the sea cliffs at Fugloya, Norway, Scandinavia, Europe

Adult male eider duck (Somateria mollissima), taking flight on the island of Bjornoya, Norway, Scandinavia, Europe

Adult Heermann's gulls (Larus heermanni) taking flight on Isla Rasita, Baja California, Mexico, North America

Adult Antarctic petrel (Thalassoica antarctica) in flight in the Drake Passage, Antarctica, Polar Regions

Porpoising adult Adelie penguins (Pygoscelis adeliae), Brown Bluff, Weddell Sea, Antarctica, Polar Regions

Adult anhinga (Anhinga anhinga) at sunset in Shark Valley, Everglades National Park, Florida, United States of America, North America

Adult Brunnich's guillemots (Uria lomvia) gathering on ice at Alkefjellet, Spitsbergen, Svalbard, Norway, Europe

Adult gentoo penguin (Pygoscelis papua) on nest with chicks at Gold Harbor, South Georgia Island, Polar Regions

Adult black-browed albatross (Thalassarche melanophris), in flight on Saunders Island, Falkland Islands, South America

Adult gentoo penguins (Pygoscelis papua), on shore fast ice in Wilhamena Bay, Antarctica, Polar Regions

Adult wattled starlings (Creatophora cinerea), on the back of a wildebeest in Serengeti National Park, Tanzania, East Africa, Africa

Adult king penguin (Aptenodytes patagonicus) returning from sea at St. Andrews Bay, South Georgia, Polar Regions

An adult martial eagle (Polemaetus bellicosus), with a helmeted guineafowl, South Luangwa National Park, Zambia, Africa

Captive adult boat-billed heron (Cochlearius cochlearius), Parque das Aves, Foz do Iguacu, Parana State, Brazil, South America

Adult endemic South Georgia pipit (Anthus antarcticus), near elephant seal bull in Gold Harbor, South Georgia, Polar Regions

An adult African sacred ibis (Threskiornis aethiopicus), Tarangire National Park, Tanzania, East Africa, Africa

An adult female Costa's hummingbird (Calypte costae) feeding in Madera Canyon, southern Arizona, Arizona, United States of America, North America

Adult brown skua (Stercorarius antarcticus), in flight in the Lemaire Channel, Antarctica, Polar Regions

An adult cattle tyrant (Machetornis rixosa), Pousa Allegre, Mato Grosso, Pantanal, Brazil, South America

Adult black-backed water tyrant (Fluvicola albiventer), on the Rio Tres Irmao, Mato Grosso, Pantanal, Brazil, South America

Researcher Susan Bird swimming with a small pod of sperm whales (Physeter macrocephalus) underwater off the coast of Roseau, Dominica, Windward Islands, West Indies, Caribbean, Central America

An adult osprey (Pandion haliaetus), perched on a fence post in Grand Canyon National Park, Arizona, United States of America, North America

Adult black-footed albatross (Phoebastria nigripes), in flight in Monterey Bay Marine Sanctuary, Monterey, California, United States of America, North America

Adult black-footed albatross (Phoebastria nigripes), in flight in Monterey Bay Marine Sanctuary, Monterey, California, United States of America, North America

Adult male surf scoter (Melanitta perspicillata) taking flight in Williams Cove, Southeast Alaska, United States of America, North America

Adult South Georgia pintail (Anas georgica georgica), Prion Island, South Georgia, UK Overseas Protectorate, Polar Regions

Adult anhinga (Anhinga anhinga) at sunset in Shark Valley, Everglades National Park, Florida, United States of America, North America

A pair of adult red birds-of-paradise (Paradisaea rubra), in courtship display on Gam Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Adult black-legged kittiwake (Rissa tridactyla) on ice at Monacobreen, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

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

Adult humpback whale (Megaptera novaeangliae), tail-lobbing, Gorda Banks, Baja California Sur, Mexico, North America

Adult grey-headed fish eagle (Haliaeetus ichthyaetus) perched on a tree, Wilpattu National Park, Sri Lanka, Asia

An adult white-bellied sea eagle (Haliaeetus leucogaster), perched in Yala National Park, Sri Lanka, Asia

An adult female black-chinned hummingbird (Arcgilochus alexandri), Madera Canyon, southern Arizona, Arizona, United States of America, North America

Adult king penguins (Aptenodytes patagonicus) returning from sea at St. Andrews Bay, South Georgia, Polar Regions

An adult parakeet auklet (Aethia psittacula) nesting on St. Paul Island, Pribilof Islands, Alaska, United States of America, North America

Adult South Georgia shag (Leucocarbo atriceps georgianus), foraging at Godthul, South Georgia, Polar Regions

Adult gentoo penguins (Pygoscelis papua), walking on the penguin highway on Cuverville Island, Antarctica, Polar Regions

Adult gentoo penguins (Pygoscelis papua), walking on the penguin highway on Cuverville Island, Antarctica, Polar Regions

Adult Adelie penguins (Pygoscelis adeliae), swimming for the shoreline, Thule Island, South Sandwich Islands, South Atlantic, Polar Regions

King penguin (Aptenodytes patagonicus), adult feeding a chick at breeding colony in Gold Harbour, South Georgia, South Atlantic, Polar Regions

An adult Galapagos penguin (Spheniscus mendiculus), on the rocks in Urbina Bay, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

An adult Mexican jay (Aphelocoma wollweberi), Big Bend National Park, Texas, United States of America, North America

Black-browed albatross (Thalassarche melanophrys) adult bonding behaviour, the Neck, Saunders Island, Falkland Islands, South America

An adult tricolored heron (Egretta tricolor) stalking prey in a stream, San Jose del Cabo, Baja California Sur, Mexico, North America

King penguin (Aptenodytes patagonica) adult and first season chick, Salisbury Plain, South Georgia, Polar Regions

Adult emperor penguins (Aptenodytes forsteri), hauled out on ice near Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Adult jabiru stork (Jabiru mycteria), on a nest near Pouso Allegre, Mata Grosso, Pantanal, Brazil, South America

Adult Adelie penguin (Pygoscelis adeliae), Coronation Island, South Orkney Islands, Antarctica, Polar Regions

An adult rock sandpiper (Calidris ptilocnemis ptilocnemis), subspecies found on St. Mathews Island, Alaska, United States of America, North America

An adult tawny eagle (Aquila rapax) in flight in Serengeti National Park, Tanzania, East Africa, Africa

Adult brown pelican (Pelecanus occidentalis) cleaning, Isla San Ildefonso, Baja California Sur, Mexico, North America

Adult, non-breeding Arctic tern (Sterna paradisaea) on ice in Paradise Bay, Antarctica, Polar Regions

An adult southern fulmar (Fulmarus glacialoides), in flight in the Bellingshausen Sea, Antarctica, Polar Regions

An adult black-footed albatross (Phoebastria nigripes) in flight at sea, Monterey Bay, California, United States of America, North America

Adult western gull (Larus occidentalis), in flight in Monterey Bay Marine Sanctuary, Monterey, California, United States of America, North America

Adult brown pelican (Pelecanus occidentalis), in flight near Isla San Pedro Martir, Baja California, Mexico, North America

An adult bird wrasse (Gomphosus varius), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

Adult brown noddy (Anous stolidus), on rocky outcropping on Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult Heermann's gulls (Larus heermanni) taking flight at sunset on Isla Rasita, Baja California, Mexico, North America