Northern giant petrel (Macronectes halli) amongst king penguin chicks at Gold Harbour, South Georgia, Southern Ocean, Polar Regions

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

King penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

Chinstrap penguins (Pygoscelis antarctica) ashore at Useful Island, Antarctica, Polar Regions

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

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

Gentoo penguins (Pygoscelis papua), breeding colony on Cuverville Island, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), breeding colony on Weincke Island, Naumeyer Channel, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), breeding colony in a snowstorm at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), breeding colony in a snowstorm at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Adult black-legged kittiwakes (Rissa tridactyla) on ice near Alexander Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

King penguins (Aptenodytes patagonicus) on the beach at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plain, South Georgia, 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

Gentoo penguin (Pygoscelis papua) chick at Jougla Point, Wiencke Island, Antarctica, Southern Ocean, Polar Regions

Chinstrap penguins (Pygoscelis antarctica) ashore at Useful Island, Antarctica, Polar Regions

Adult snow petrel (Pagodroma nivea nivea) near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Gentoo penguins (Pygoscelis papua) nesting colony almost buried by snow during snow storm at Brown Bluff, Antarctica, Polar Regions

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Antarctic shag (Phalacrocorax atriceps bransfieldensis), pair on nest at breeding site at Jougla Point, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

Chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Adult Arctic Skua (Stercorarius parasiticus), on ice floe in the Svalbard Archipelago, Norway, Arctic, Europe

King penguins (Aptenodytes patagonicus) on the beach at breeding and nesting colony at Salisbury Plain in the Bay of Isles, South Georgia, Southern Ocean, Polar Regions

Adelie penguins (Pygoscelis adeliae), in snow storm at breeding colony at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

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

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

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

Gentoo penguin (Pygoscelis papua) nesting colony at Jougla Point on Wiencke Island, Antarctica, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

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

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

Adult long-tailed ducks (Clangula hyemalis) in breeding plumage in the Svalbard Archipelago, Norway

Adult male common eider ducks (Somateria mollissima) in breeding plumage in the Svalbard Archipelago, Norway

Brunnichs guillemots (Uria lomvia) in flight at Cape Fanshawe in the Svalbard Archipelago, Norway

Adelie penguins (Pygoscelis adeliae), with chinstrap penguins (Pygoscelis antarctica), on ice at Booth Island, Antarctica, Polar Regions

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

Adult gentoo penguin (Pygoscelis papua), leaping off ice shelf at Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua), mating at Booth Island, Antarctica, Southern Ocean, Polar Regions

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

Gentoo penguins (Pygoscelis papua), breeding colony on Weincke Island, Naumeyer Channel, Antarctica.

Adult king penguins (Aptenodytes patagonicus) returning from sea to the breeding colony at Salisbury Plain, South Georgia, Polar Regions

Adelie penguin (Pygoscelis adeliae), feeding chick at breeding colony at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Adelie penguins (Pygoscelis adeliae), in snow storm at breeding colony at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Cooper Bay, South Georgia

Sunrise on king penguin (Aptenodytes patagonicus) at nesting and breeding colony at Salisbury Plain, South Georgia, Polar Regions

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

Gentoo penguins (Pygoscelis papua) nesting colony almost buried by snow during snow storm at Brown Bluff, Antarctica, Polar Regions

Adult chinstrap penguin (Pygoscelis antarctica), at breeding colony at Half Moon Island, Antarctica, Polar Regions

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

A gentoo penguin (Pygoscelis papua) breeding colony on Cuverville Island in a snowstorm, Antarctica, Polar Regions

Southern elephant seal bull (Mirounga leoninar), throwing sand at breeding beach in St. Andrews Bay, South Georgia, Polar Regions

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

Gentoo penguin pair (Pygoscelis papua), mating at breeding colony site on Cuverville Island, Antarctica, Polar Regions

Polar Bear (Ursa maritimus) on sea ice off the sub-arctic coast of Hudson Bay, Churchill, Manitoba, Canada. Bears come to the coast of Hudson Bay in Fall waiting for the ice to freeze, and looking for a careless seal or dead whale to wash up. Global warming has shortened their winter so they are increasingly anxious as they wait for winter. While they wait, they engage in frequent wrestling matches to determine a mating hierarchy for the breeding season in March and April, and regularly check on the ice to see if it will carry them out to sea.

Muskox, muskoxen (Ovibos moschatus), male, bull, Yukon Territory, Canada

Heck cattle, cow and bull on winter pasture, re-breeding of the aurochs, Droemling nature park Park, Saxony-Anhalt, Germany, Europe

Heck Cattle (Bos primigenius taurus), an attempt to breed back the extinct Aurochs from domestic cattle. Winter in the National Park Bavarian forest (Bayerischer Wald)(enclosure). Europe, Central Europe, Germany, Bavaria, February

Heck Cattle (Bos primigenius taurus), an attempt to breed back the extinct Aurochs from domestic cattle. Winter in the National Park Bavarian forest (Bayerischer Wald)(enclosure). Europe, Central Europe, Germany, Bavaria, February

The church of Holar during winter. Holar is a famous archaeological site and is home to the Holar University Collage focusing on agriculture, horse breeding and tourism. europe, northern europe, iceland, March

Close-Up Of Male Willow Ptarmigan Changing From Winter To Breeding Plumage Near Savage River, Denali National Park & Preserve, Interior Alaska, Spring

Close-up portrait of a male willow ptarmigan (Lagopus lagopus) showing early breeding colors in its neck and eye combs, surveying its high-country territory in Southcentral Alaska's Chugach Mountains on an April day. The head and neck will become completely chocolate-brown as the bird's breeding colors develop, Alaska, United States of America

King eider duck (Somateria spectabilis) adult male in breeding plumage on winter ice floes during a snow shower in Varanger, Norway