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Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Southern right whale (Eubalaena australis) mother and calf being harassed by kelp gull, Peninsula Valdez, Argentina

Adult tufted puffin (Fratercula cirrhata) on the water at South Marble Island, Glacier Bay National Park, Alaska, United States of America

Adult male spruce (Franklin's) grouse (Falcipennis canadensis) near Brooks River, Katmai National Park, Alaska, United States of America

Adult dovekie (Alle alle alle) breeding area on the island of Bolscheoya in the Svalbard Archipelago, Norway

Brunnichs guillemot (Uria lomvia) pair taking flight at Cape Fanshawe in the Svalbard Archipelago, Norway

Adult great skua (Stercorarius skua) being harassed by Arctic terns (Sterna paradisaea) guarding their nest sites, Svalbard, Norway

Adult black-legged kittiwakes (Rissa tridactyla) in flight in the Svalbard Archipelago, Barents Sea, Norway

Young male polar bear (Ursus maritimus), feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Northern gannet (Morus bassanas) breeding colony at the cliffs of Noss, Shetland Islands, Scotland, United Kingdom

Adult black guillemot (Cepphus grylle) in summer plumage near Vigur Island in Isafjardardjup Bay, Iceland

Crowned Woodnymph (Thalurania colombica) a species of Hummingbird at Arenal Volcano National Park, Alajuela Province, Costa Rica, Central America

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

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

White-crowned Sparrow (Zonotrichia leucophrys), Caballo Lake State Park, New Mexico, United States of America, North America

Western Screech-Owl (Megascops kennicottii) in captivity, Arizona Sonora Desert Museum, Tucson, Arizona, United States of America, North America

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

Adult Magellanic penguin (Spheniscus magellanicus) at a breeding site on Peninsula Valdez, Patagonia, Argentina, South America

Adult dovekies (Little Auk) (Alle alle) at their breeding site amongst scree slopes at Rubini Rock, Tikhaya Bay, Hooker Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

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

Vanikoro flycatcher (Myiagra vanikorensis), looking for insects at the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

African openbill (Anastomus lamelligerus), Zimanga Game Reserve, KwaZulu-Natal, South Africa, Africa

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

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

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Heermann's gulls (Larus heermanni), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North Anerica

Bald eagle (Haliaeetus leucocephalus) in flight on final approach, Farmington Bay, Utah, United States of America, North America

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Adult female upland goose (Chloephaga picta) with goslings on Carcass Island in the Falkland Islands

Adult Patagonian crested duck (Lophonetta specularioides specularioides) feeding at low tide on Carcass Island, Falkland Islands

Southern right whale (Eubalaena australis) mother being harassed by kelp gull, near Puerto Pyramides, Argentina

Mallard drake (Anas platyrhynchos), stretching wings, Martin Mere Wildfowl and Wetlands Trust Reserve, Burscough, Lancashire, England, United Kingdom, Europe

An adult great blue heron (Ardea herodias) perched beside a river in Misty Fjords National Monument, United States of America, North America

Adult black-legged kittiwake (Rissa tridactyla) in combat with a second kittiwake near Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Seagull nesting on the Lihou islet, Island of Guernsey, Bailiwick of Guernsey, British Crown dependency, English Channel, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

An adult ivory gull (Pagophila eburnea) on ringed seal kill on Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, 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) being attacked in flight by a great frigatebird (Fregata minor) in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Red-vented bulbul (Pycnonotus cafer), at the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Arctic birds on an Iceberg on Belcher island, Devon island, Nunavut, Canadian Arctic, Canada, North America

Northern rockhopper penguin (Eudyptes moseleyi) covered in spilled oil from the wreck of the MS Oliva, Nightingale island, Tristan da Cunha Group, South Atlantic Ocean

Adult spectacled petrel (Procellaria conspicillata) in flight near Nightingale Island, part of the Tristan da Cunha Group, South Atlantic Ocean

Adult brown Skua (Catharacta antarctica), in flight near the Antarctic peninsula in the Southern Ocean, Antarctica, Polar Regions

Southern giant petrel (Macronectes giganteus) in flight against the sun near South Georgia, Southern Ocean, Polar Regions

Southern giant petrel (Macronectes giganteus) cleaning itself on the water, South Georgia, Southern Ocean, Polar Regions

Anhinga (Anhinga anhinga) perching on branch on Lake Sandoval, Tambopata National Reserve, Peru, South America

Anhinga (Anhinga anhinga) perching on branch on Lake Sandoval, Tambopata National Reserve, Peru, South America

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

Wandering albatross (Diomedea exulans) chick at breeding colony on Prion Island, Bay of Isles, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrel (Macronectes halli) scavenging and feeding on a dead fur seal pup at St. Andrews Bay, South Georgia

Female southern elephant seal (Mirounga leonina) with newborn pup as skuas (Catharacta antarctica) fight for the afterbirth, South Georgia

Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird of the Americas that feeds on crustacea, Bermuda, Atlantic

South American black vulture (Coragyps atratus brasiliensis), a common scavenger, river mouth near Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Adult black-browed albatross (Thalassarche melanophrys), trio in courtship display at nesting site on New Island, Falklands, South America

Antarctic shag (Phalacrocorax atriceps bransfieldensis), in flight with nesting material in its beak at Jougla Point, Antarctica, Polar Regions