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

Imperial Shag (Phalacrocorax atriceps), pair exhibiting courtship behavior on New Island in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Skull of an adult female leopard seal (Hydrurga leptonyx), on display at the Natural History Museum in Stanley, Falkland Islands, South America

Macaroni penguins (Eudyptes chrysolophus) scrambling up steep cliffs at Hercules Bay on South Georgia Island, Polar Regions

Northern giant petrel (Macronectes halli) threat display on the beach at Stromness, South Georgia, Southern Ocean, Polar Regions

Mother southern elephant seals (Mirounga leonina) posturing at breeding site at Peggotty Bluff on South Georgia Island, Polar Regions

Female southern elephant seals (Mirounga leonina) showing slight aggression at Moltke Harbor on South Georgia, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Hundreds of southern elephant seals (Mirounga leonina) hauled out onto the breeding beach at Gold Harbour, South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) pup interacting with curious king penguin at Gold Harbour on South Georgia, Polar Regions

Adult female sea otter (Enhydra lutris kenyoni) eating urchins she has gathered off the sea floor in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

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

Adult black-legged kittiwake (Rissa tridactyla) in flight near Alexander Island in Franz Josef Land, Russia, Eurasia

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the ice in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion mother nursing pup (Zalophus wollebaeki) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua), leaping into the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Polar Regions

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Polar Regions

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

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

A small group of introduced reindeer (Rangifer tarandus) before eradication in Stromness Bay, South Georgia, Polar Regions

Adult grey-headed albatross (Thalassarche chrysostoma) (grey-headed mollymawk), Elsehul, South Georgia, Polar Regions

Adult male Antarctic fur seal (Arctocephalus gazella) head detail, Antarctica, Southern Ocean, Polar Regions

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

Nesting Red-legged Cormorant (Poikilocarbo gaimardi) with chicks, Ballestas Islands, Paracas, Peru, South America

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

Adult great egret (Ardea alba egretta) feeding at low tide in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Juvenile Galapagos brown pelican (Pelecanus occidentalis urinator), smallest species of pelican worldwide, feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

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

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Antarctica, Polar Regions

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

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Female mantled howler monkey (Alouatta palliata) with clinging infant eating flower, Pacific coast forest, Esperanza, Nosara, Guanacaste, Costa Rica

An adult eastern osprey (Pandion haliaetus cristatus), in flight over Montgomery Reef, Kimberley, Western Australia, Australia, Pacific

Adult rockhopper penguins (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

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

An adult anhinga (Anhinga anhinga), taking flight on New River near the Mesoamerican archaeological site of Lamanai, Belize

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

Southern giant petrel (Macronectes giganteus), feeding on a sheep carcass at West Point Island, Falkland Islands, South America

Adult king penguins (Aptenodytes patagonicus) amongst chicks (okum boys) at Salisbury Plain, South Georgia, Polar Regions

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

Southern yellow billed hornbill, Pilanesberg National Park, North West Province, South Africa, Africa

Southern elephant seal (Mirounga leonina) weaner pup sleeping on the beach at Gold Harbour on South Georgia, Polar Regions

Curious southern elephant seal (Mirounga leonina) weaner pup inspects the spotting scope at Gold Harbour, South Georgia, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) fleeing from another male challenger at Gold Harbour, South Georgia, Polar Regions

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

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

Young southern elephant seal (Mirounga leonina) bulls mock-fighting among king penguins at Gold Harbour, South Georgia, Polar Regions

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

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

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding, Southeast Alaska, United States of America, North America

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Snow Pass, Alaska, United States of America, North America

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

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

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

A young killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult female polar bear (Ursus maritimus) rolling in snow to clean its fur on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Chinstrap penguins (Pygoscelis antarctica), ecstatic display at breeding colony at Half Moon Island, Antarctica, Polar Regions

A curious young polar bear (Ursus maritimus) on ice floe 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

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Tourists at Green Sea Turtle (Chelonia mydas) nesting site at night on Long Beach on Ascension Island, Tropical Atlantic Ocean, South Atlantic Ocean

Antarctic fur seal pups (Arctocephalus gazella) playing in Fortuna Bay on South Georgia, Southern Ocean, Polar Regions

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

Adult striated caracara (Phalcoboenus australis) on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Adult female leopard seal (Hydrurga leptonyx) hauled out on ice at Brown Bluff near the Antarctic Peninsula, Antarctica, Polar Regions

Crabeater seal (Lobodon carcinophaga) swimming near iceberg at Booth Island near the Antarctic Peninsula, Antarctica, Polar Regions

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