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Young wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

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

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

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

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

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

A small pod of killer whales (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

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

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

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

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

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

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

Antarctic fur seal pups (Arctocephalus gazella) on Prion Island in the Bay of Isles on South Georgia, Southern Ocean, Polar Regions

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

Adult fin whale (Balaenoptera physalus) surfacing in the rich waters off the continental shelf near South Georgia, Polar Regions

Adult light-mantled sooty albatrosses (Phoebetria palpebrata) on the wing in Elsehul on South Georgia, Southern Ocean, Polar Regions

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

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A small pod of killer whales (Orcinus orca) off the west coast of Isabela Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A small pod of Type B killer whales (Orcinus nanus) just outside Duse Bay in the Weddell Sea, Antarctica, Polar Regions

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

King penguins (Aptenodytes patagonicus) at sunrise on South Georgia Island, Southern Ocean, Polar Regions

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

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding Zodiacs on New Island in the Falkland Islands

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near 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

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

Adult macaroni penguin (Eudyptes chrysolophus) porpoising for speed while traveling to their breeding colony on South Georgia, Southern Ocean, Polar Regions

Adult fin whale (Balaenoptera physalus) surfacing in the rich waters off the continental shelf near South Georgia in the Southern Ocean, Polar Regions

Young wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

Adult wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

Adult king penguin (Aptenodytes patagonicus) in the act of feeding chick on South Georgia Island, Southern Ocean, Polar Regions

Southern Right Whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

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

Adult black-legged kittiwakes (Rissa tridactyla) feeding at the base of a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

Northern fulmar (Fulmarus glacialis glacialis) on the wing over calm seas in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

Adult Commerson's dolphins (Cephalorhynchus commersonii) surfacing, Carcass Island in the Falkland Islands, South America

Adult cape petrels (Daption capense) feeding near Deception Island, Antarctica, Southern Ocean, Polar Regions

Antarctic fur seal pups (Arctocephalus gazella) mock-fighting on South Georgia, Southern Ocean, Polar Regions

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

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

A pair of long-beaked common dolphins (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

A pair of long-beaked common dolphins (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bears (Ursus maritimus) adult and cub in snow. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Snow covering the ash and mud slides at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) feeding side-by-side on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen, Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in Woodfjorden, Spitsbergen, Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Curious Polar bear (Ursus maritimus) looking up at National Geographic Explorer, Spitsbergen, Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in Woodfjorden, Spitsbergen, Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Blizzard conditions cause the ocean's surface to begin to freeze in Dahlmann Bay, Antarctica, Southern Ocean. MORE INFO First signs of grease ice as the surface of the sea begins to freeze.

Polar bears (Ursus maritimus) adults and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bear (Ursus maritimus) adult with seal kill. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in Woodfjorden, Spitsbergen, Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Blizzard conditions cause the ocean's surface to begin to freeze in Dahlmann Bay, Antarctica, Southern Ocean. MORE INFO First signs of grease ice as the surface of the sea begins to freeze.

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway