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Gentoo penguins (Pygoscelis papua) mate during breeding season, the Neck, Saunders Island, Falkland Islands, South America

Leucistic king penguin chick, Aptenodytes patagonicus, at breeding colony on Salisbury Plain, South Georgia Island, Atlantic Ocean

Heermann's gulls (Larus heermanni) mating, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Common ostrich (Struthio camelus), male in breeding plumage, Kgalagadi Transfrontier Park, South Africa, Africa

Common ostrich (Struthio camelus), male in breeding plumage with female, Kgalagadi Transfrontier Park, South Africa, Africa

Wattled Starling (Creatophora cinerea), male in breeding plumage, Kruger National Park, South Africa, Africa

Drake common eider (Somateria mollissima) in flight in breeding plumage, Longyearbyen, Spitsbergen, Arctic, Norway, Europe

Gentoo penguins (Pygoscelis papua) breeding colony, the Neck, Saunders Island, Falkland Islands, South America

Wattled starling (Creatophora cinerea) in non-breeding plumage, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Leucistic king penguin chick, Aptenodytes patagonicus, at breeding colony on Salisbury Plain, South Georgia Island, Atlantic Ocean

Elegant tern (Thalasseus elegans) and Heermann's gull (Larus heermanni) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Red-billed gull (Chroicocephalus scopulinus) in gannet breeding colony at Cape Kidnappers, Napier, North Island, New Zealand, Pacific

Gentoo penguins (Pygoscelis papua) breeding colony, the Neck, Saunders Island, Falkland Islands, South America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Breeding pair of Chilean skuas (Stercorarius chilensis), Seno Agostini Fjord, Strait of Magellan, Patagonia, Chile, South America

Great Blue Heron (Ardea herodias), the largest North American heron, in breeding display, United States of America, North America

Leucistic king penguin chick, Aptenodytes patagonicus, at breeding colony on Salisbury Plain, South Georgia Island, Atlantic Ocean

Leucistic king penguin chick, Aptenodytes patagonicus, at breeding colony on Salisbury Plain, South Georgia Island, Atlantic Ocean

Elegant terns (Thalasseus elegans) in flight at breeding colony on Isla Rasa, Baja California, Mexico, North America

Elegant terns (Thalasseus elegans), at breeding colony on Isla Rasa, Baja California, Mexico, North America

Black-browed albatross, Thalassarche melanophris, in flight at breeding colony on West Point Island, Falkland Islands, South Atlantic Ocean

Gentoo penguin (Pygoscelis papua) breeding colony in snow storm at Port Lockroy, Antarctica, Polar Regions

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

A common guillemot (Uria aalge) breeding colony on the cliffs of Bjornoya, Svalbard Archipelago, Arctic, Norway, Europe

Red-billed gulls (Chroicocephalus scopulinus), breeding colony near Dunedin, Otago, South Island, New Zealand, Pacific

Elegant tern (Thalasseus elegans) and Heermann's gull (Larus heermanni) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Heermann's gulls (Larus heermanni) mating, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Adult Antarctic shags (Phalacrocorax (atriceps) bransfieldensis), breeding colony on Jougla Point, Weincke Island, Antarctica, Polar Regions

Elegant terns (Thalasseus elegans) mating, Isla Rasa, Gulf of alifornia (Sea of Cortez), Baja California, Mexico, North America

Adult Antarctic shags (Phalacrocorax (atriceps) bransfieldensis), breeding colony on Jougla Point, Weincke Island, Antarctica, Polar Regions

Breeding pair of kelp geese (Chloephaga hybrida), Wildlife Conservation Society Preserve of Karukinka, Strait of Magellan, Chile, South America

Black-browed albatross, Thalassarche melanophris, at breeding colony on West Point Island, Falkland Islands, South Atlantic Ocean

Black-browed albatross, Thalassarche melanophris, at breeding colony on New Island, Falkland Islands, South Atlantic Ocean

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Adult Antarctic shags (Phalacrocorax (atriceps) bransfieldensis), breeding colony on Jougla Point, Weincke Island, Antarctica, Polar Regions

Imperial shag, Phalacrocorax atriceps, breeding site at small islet in the Beagle Channel, Ushuaia, Argentina, South America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans) in flight at breeding colony on Isla Rasa, Baja California, Mexico, North America

Imperial shag (Phalacrocorax atriceps albiventer) breeding colony on New Island, Falkland Islands, South Atlantic Ocean, South America

Heermann's gull (Larus heermanni) adult with egg, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Black-browed albatross, Thalassarche melanophris, at breeding colony on New Island, Falkland Islands, South Atlantic Ocean

Elegant terns (Thalasseus elegans) mating, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Arctic tern in flight, Sterba paradisaea, Isle of May breeding colony, Fife, Scotland, United Kingdom, Europe

Southern red bishop (Euplectes orix), male in breeding plumage, Pilanesberg Game Reserve, South Africa, Africa

Southern red bishop (Euplectes orix), male in breeding plumage, Pilanesberg National Park, North West Game Reserve, South Africa, Africa

King penguins (Aptenodytes patagonicus) at breeding and nesting colony at Salisbury Plain, South Georgia, UK Overseas Protectorate, Polar Regions

Imperial shag (Phalacrocorax atriceps), returning to the nest on New Island in the Falkland Islands, 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

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

Adult Dovekie (Little Auk) (Alle alle) breeding area in the Norge Islands in the Svalbard Archipelago, Norway, Arctic, Europe

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

Adult female common eider ducks (Somateria mollissima) swimming with ducklings of Edgeoya in Svalbard, 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

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

An Atlantic Puffin (Fratercula arctica), on a cliff edge in Borgarfjaroarhofn, Iceland, Polar Regions

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

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

Adult red-footed booby (Sula sula) returning to the nest site in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A breeding Shag (Gulosus aristotelis) by its nest on cliffs at Braes peninsula, a red listed bird, The Braes, Portree, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

South American sea lion bull (Otaria flavescens) at breeding colony just outside Ushuaia, Beagle Channel, Argentina, South America

Adelie penguins (Pygoscelis adeliae) hauled out onto the ice near Adelaide Island, Antarctica, Polar Regions

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

Gentoo penguin (Pygoscelis papua) adult with chicks at breeding colony on Booth Island, Antarctica, Southern Ocean, Polar Regions

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

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

Blue footed booby (sula nebouxii) nest, Punta Pitt, San Cristobal island, Galapagos, UNESCO, Ecuador

Blue footed booby (sula nebouxii) incubating eggs at Punta Pitt, San Cristobal Island, Galapagos, UNESCO, Ecuador

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 rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

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 harlequin duck (Histrionicus histrionicus) in full breeding plumage in the calm waters of Lake Myvatn, Iceland

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions

Adult southern rockhopper penguin (Eudyptes chrysocome) at breeding colony on Saunders Island, Falkland Islands, South America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

King penguin (Aptenodytes patagonicus) breeding colony at Salisbury Plain, South Georgia, Polar Regions

Sunrise on king penguin (Aptenodytes patagonicus) breeding colony at Gold Harbor, South Georgia, Polar Regions

Adult King penguin (Aptenodytes patagonicus) breeding colony at Gold Harbor, South Georgia, Polar Regions

King penguin (Aptenodytes patagonicus) head detail at its breeding colony at Gold Harbor, South Georgia, Polar Regions

King penguin (Aptenodytes patagonicus) adults establishing partners at breeding colony in Gold Harbor, South Georgia, Polar Regions

King penguin (Aptenodytes patagonicus) adult with chick at breeding colony in Gold Harbor, South Georgia, Polar Regions