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Adult black-legged kittiwakes (Rissa tridactyla) feeding at the base of a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

Common guillemot (Uria aalge) nesting on Bear Island (Bjornoya) in the Svalbard Archipelago, Norway, Arctic, Europe

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

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

Greater flamingos (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult Nazca booby (Sula grantii) with downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) at sunset in the Galapagos Island Archipelago, 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

Local small Senegalese fishing boat near Ile des Oiseaux (Bird Island) in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Adult elegant terns (Thalasseus elegans), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North America

Adult macaroni penguins (Eudyptes chrysolophus) plunging into the sea leaving their breeding colony at Elsehul on South Georgia, Southern Ocean, Polar Regions

Adult macaroni penguins (Eudyptes chrysolophus) porpoising for speed while traveling to breeding colony, South Georgia, Polar Regions

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

Black-browed albatross (Thalassarche melanophrys) in flight on West Point Island, Falkland Islands, South Atlantic Ocean, South America

Adult brown skuas (Catharacta antarctica) feeding on a penguin carcass near the Antarctic peninsula, Antactica, Polar Regions

Neotropic cormorant (Phalacrocorax brasilianus) (Phalacrocorax olivaceus) (Nannopterum brasilianum), Lake Sandoval, Tambopata National Reserve, Peru, South America

First year Adelie penguin (Pygoscelis adeliae) chick at breeding colony at Brown Bluff, Antarctica, Polar Regions

Mute swans (Cygnus olor) swimming near the Old Cornmill after Worcester was inundated by the River Severn bursting its banks, Worcester, Worcestershire, England, United Kingdom, Europe

Magellanic penguin (Spheniscus magellanicus), Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Red-winged blackbird (Agelaius phoeniceus), male, Lac Le Jeune Provincial Park, British Columbia, Canada, North America

Adult sanderling (Calidris alba) feeding on the tidal flat 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

Adelie penguin (Pygoscelis adeliae) in snowstorm at Brown Bluff on the Antarctic Peninsula in the Weddell Sea, Antarctica, Polar Regions

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

Yellow-footed gull (Larus livens), in flight protecting its nest on Isla Coronado, 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

Adult female green kingfisher (Chloroceryle americana), with fish on the Rio Negro, Mata Grosso, Pantanal, Brazil, South America

A pair of adult rufous-tailed jacamars (Galbula ruficauda), sharing an insect, Rio Cuiaba, Pantanal, Mato Grosso, Brazil, South America

Common Terns (Sterna hirundo), in their breeding colony in June, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

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

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

Adult Brunnich's guillemots (Uria lomvia) in a territorial dispute at Alkefjellet, Spitsbergen, Svalbard, Norway, Europe

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

Portrait of a two-banded plover (Charadrius falklandicus) in sandy grassland, Volunteer Point, Falkland Islands, South America

Portrait of a female upland goose (Chloephaga picta) standing in grassland at Volunteer Point, Falkland Islands, South America

Nesting storks on the the Iglesia de San Martin, on the left and centre, and Torre del Alfiler, on the right, Trujillo, Caceres, Extremadura, Spain, Europe

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

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

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

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

An Australian darter (Anhinga novaehollandiae) in flight on the Ord River, Kimberley, Western Australia, Australia, Pacific

An adult azure kingfisher (Alcedo azurea) swallowing a fish on the Daintree River, Daintree rain Forest, Queensland, Australia, Pacific

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

Adult imperial shag (Phalacrocorax atriceps) landing at nest site on New Island, Falkland Islands, U.K. Overseas Protectorate, South America

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

King penguins (Aptenodytes patagonicus) in early morning light at Gold Harbor, South Georgia, Polar Regions

Nevis Botanical Garden, Nevis, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

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

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

Audubon's Yellow-Rumped Warbler (Dendroica coronata auduboni), Yellowstone National Park, Wyoming, United States of America, North America

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

An adult black-collared hawk (Busarellus nigricollis), Nauta Cano, Pacaya-Samiria Reserve, Peru, South America

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

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

Gentoo penguin (Pygoscelis papua) uses penguin highway past a colony, Neko Harbour, Anvord Bay, Antarctic Peninsula, Antarctica, Polar Regions

Yellow billed stork (Mycteria ibis) fighting, Lake Manyara National Park, Tanzania, East Africa, Africa

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

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

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

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

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

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

Adult Brandt's cormorant (Phalacrocorax penicillatus), Isla San Ildefonso, Baja California Sur, Mexico, North America

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

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

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