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Beachmaster bull southern elephant seal (Mirounga leonina) attempting to mate at Peggotty Bluff, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

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

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

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

King penguin (Aptenodytes patagonicus) detail at breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) 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

Adult southern rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony, Falkland Islands, South America

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

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

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, 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 king penguin (Aptenodytes patagonicus) in the act of feeding chick on South Georgia Island, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) swimming near 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

Adult wandering albatrosses (Diomedea exulans) at nest site on Prion Island in the Bay of Isles, South Georgia, Polar Regions

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

Adult Magellanic penguins (Spheniscus magellanicus) at breeding and molting site on Carcass Island, Falkland Islands, South America

Adult male Antarctic fur seal (Arctocephalus gazella) harassing a skua at Torgersen Island, Antarctica, Polar Regions

Gentoo penguin (Pygoscelis papua) adult with chicks on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Adult gentoo penguin (Pygoscelis papua) with minutes-old newly hatched chick at Gold Harbor on South Georgia

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

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

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

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

Black-browed albatross (Thalassarche melanophrys) breeding colony on Steeple Jason Island in the Falkland Islands

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

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

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

Female mallard duck with newly hatched ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Female mallard duck with 14 newly hatched ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Female mallard duck with new ducklings, Anas platyrhynchos, strolling on garden patio in springtime at Swinbrook, the Cotswolds, UK

Female Canada Goose, Branta canadensis, with young goslings, on River Windrush at Swinbrook, the Cotswolds, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Moorhen's nest, with seven eggs laid, made with twigs among iris plants in a pond in Swinbrook, the Cotswolds, Oxfordshire, UK

Female mallard duck with new ducklings, Anas platyrhynchos, on a stream in springtime at Swinbrook, the Cotswolds, UK

Masked Pufferfish (Arothron diadematus). Usually solo, seen here feeding on Acropora Sp. coral. Seen in large groups only during the breeding season. Found only in the Red Sea. Red Sea.

Masked Pufferfish (Arothron diadematus). Usually solo, seen here feeding on (Acropora Sp.) coral. Seen in large groups only during the breeding season. Found only in the Red Sea. Red Sea.

Adult Weddell Seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Southern Ocean

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.

Male Frigate bird with red gular pouch that is inflated during the breeding season to attract a mate, Heart, Galapagos, Ecuador, South America

Common starling (Sturnus vulgaris) feeding young bird at breeding cavity, North Rhine-Westphalia, Germany, Europe

Atlantic puffin (Fratercula arctica) on sea cliff top and flying gannets in seabird colony, Shetland Islands, Scotland, UK

Aerial view of n (Morus bassanus) on the breeding rock Langanes with coast, Langanesbyggo, Norourland eystra, Iceland, Europe

Atlantic puffin (Fratercula arctica) on sea cliff top watching gannet flying by in seabird colony, Scotland, UK

Atlantic puffin (Fratercula arctica) on sea cliff top and great skua chasing gannet in seabird colony, Shetland Islands, Scotland, UK

Great crested grebe (Podiceps cristatus) at the nest with young bird in plumage, Oldenburger Muensterland, Vechta, Lower Saxony, Germany, Europe

Flying great cormorant (Phalacrocorax carbo) with nesting material building a nest, Lembruch, Lower Saxony, Germany, Europe

Great crested grebe (Podiceps cristatus) copulating at the nest, Oldenburger Muensterland, Vechta, Lower Saxony, Germany, Europe

Northern gannet (Morus bassanus) on the breeding rock Langanes, Langanesbyggo, Norourland eystra, Iceland, Europe

Spoonbill (Platalea leucorodia), flying with nesting material, Langeoog, Lower Saxony, Germany, Europe

Middle spotted woodpecker (Dendrocopos medius), with food in its beak at the breeding cavity, North Rhine-Westphalia, Germany, Europe

Hoopoe (Upupa epops) male feeding brooding female, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

Two Puffins (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing on grass, calling, bird rock Latrabjard, Westfjords, Iceland, Europe

Northern gannet (Morus bassanus), animal pair at greeting, animal portrait, Lummenfelsen, Heligoland, Schleswig-Holstein, Germany, Europe

Black-browed Albatross (Thalassarche melanophris) chick on its nest, Saunders Island, Falkland Islands, South America