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Male southern elephant seal (Mirounga leonina) pups mock fighting on South Georgia Island, Southern Ocean

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

Young adult bull southern elephant seal (Mirounga leonina) holding young pup's head underwater trying to kill it, South Georgia Island, Southern Ocean

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

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

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

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

Nurse shark (Ginglymostoma cirratum), with boat in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

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

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

West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the 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

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern 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) breaching along the west side of Chatham Strait in 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 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

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

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

Adult sea otter (Enhydra lutris kenyoni) mother with her pup on her chest in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

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

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

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

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

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

Snow covering the old barrel staves at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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 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

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

The Lindblad Expedition ship National Geographic Explorer transits Lemaire Channel on the west side of the Antarctic peninsula in Antarctica

A curious young polar bear (Ursus maritimus) swimming the width of the fjord near 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

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) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

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

Polar bear (Ursus maritimus) observed by National Geographic Explorer along the northwestern coast of 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

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

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 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

Curious Polar bear (Ursus maritimus) looking up at National Geographic Explorer, Spitsbergen, 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.

Abandoned water boat at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, 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

Antarctic fur seal pup (Arctocephalus gazella) caught in fishing net on South Georgia, Southern Ocean

Adult male polar bear (Ursus maritimus) on multi-year ice floes in the Barents Sea off the eastern coast of Spitsbergen in the Svalbard Archipelago, Norway

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

Antarctic fur seal pup (Arctocephalus gazella) caught in fishing net on South Georgia, Southern Ocean

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

Tractor buried in ash at whalers bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean

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

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

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

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

Grave markers at Whalers Bay inside of the caldera at Deception Island, South Shetland Islands, Antarctica, Southern Ocean