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Giant king penguin (Aptenodytes patagonicus) colony and a cruise ship, Salisbury Plain, South Georgia, Antarctica, Polar Regions

California gray whale calf (Eschritius robustus), with tourists in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale calf (Eschritius robustus), with tourists in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Adult California gray whale (Eschritius robustus), with tourists in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Transient killer whale (Orcinus orca), breaching in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

Transient killer whale (Orcinus orca) near boat in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

Farallon Islands, Great white shark diving paradise, San Francisco, California, United States of America

Farallon Islands, Great white shark diving paradise, San Francisco, California, United States of America

Farallon Islands, Great white shark diving paradise, San Francisco, California, United States of America

Farallon Islands, Great white shark diving paradise, San Francisco, California, United States of America

Wild flowers near Skala Polichnitos, Lesbos(Lesvos) Island, Greece, Greek Islands, Aegean Sea, Europe

Adult male Steller Sea Lion (Eumetopias jubatus) hauled out on Race Rocks, British Columbia, Canada. Pacific Ocean.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

Curious adult leopard seal (Hydrurga leptonyx) approaches Zodiac near Booth Island, Antarctica, Southern Ocean

Adult male green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

Chinstrap penguin (Pygoscelis antarctica) colony at Baily Head on Deception Island, South Shetland Island Group, Antarctica

A very rare sighting of an adult blue Whale (Balaenoptera musculus) flukes-up dive off the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Barents Sea, Norway

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

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

Sub-adult bull California sea lions (Zalophus californianus) mock-fighting on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

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

Adult black-necked stilt (Himantopus mexicanus) wading and feeding in a brackish water lagoon at Punta Cormorant on Floreana Island, Galapagos, Ecuador, Pacific Ocean.

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, Southeastern Alaska, USA. Pacific Ocean

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Hawaiian Spinner Dolphin (Stenella longirostris) spinning, possibly to dislodge attached remoras, Lanai, Hawaii, USA, Pacific Ocean

Lindblad Expeditions guests with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult pigeon guillemot (Cepphus columba) in breeding plumage with a capelin in its beak in Chatham Strait, Southeast Alaska, USA, Pacific Ocean.

Galapagos white-cheeked pintail (Anas bahamensis galapagensis) feeding near giant tortoise in the Galapagos Island Archipelago, Ecuador

Hawaiian Spinner Dolphin (Stenella longirostris) spinning, possibly to dislodge attached remoras, Lanai, Hawaii, USA, Pacific Ocean

Adult female leopard seal (Hydrurga leptonyx) with Lindblad Expedition guests at Brown Bluff near the Antarctic Peninsula, Southern Ocean

Adult kelp gull (Larus dominicanus) foraging for small crustaceans in Ushuaia, Tierra del Fuego, Argentina, Southern Ocean

South American Sea Lion (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Beagle Channel, Argentina

Adult black-necked stilt (Himantopus mexicanus) wading and feeding in a brackish water lagoon at Punta Cormorant on Floreana Island, Galapagos, Ecuador, Pacific Ocean.

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

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

Harp seal (Pagophilus groenlandicus) hauled out on the pack-ice in seas between Iceland and Greenland in the Denmark Strait

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

California gray whale (Eschrichtius robustus) calf with excited whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico

A lone adult emperor penguin (Aptenodytes forsteri) and crabeater seal on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica.

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA

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

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

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

Lindblad Expeditions guests on board the National Geographic Explorer with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice, Antarctica

Long-beaked common dolphin pod (Delphinus capensis) bow riding the National Geographic Sea Bird, southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

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

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Adult bull Orca - also called Killer Whale - (Orcinus orca) surfacing in the calm waters of Southeast Alaska, USA. Note the exceptionally tall dorsal fin - the field diagnostic for a mature male Orca.

Polar bear (Ursus maritimus) observed by National Geographic Explorer along the northwestern coast of Spitsbergen in the Svalbard Archipelago, Norway

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

Curious king penguin (Aptenodytes patagonicus) breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean.

Young California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Lindblad Expeditions guests with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica.

A curious cow calf and escort humpback whale (Megaptera novaeangliae) approach the boat underwater in the AuAu Channel, Hawaii, USA, Pacific Ocean

Macaroni Penguins (Eudyptes chrysolophus) in Elsehul Bay on South Georgia Island in the Southern Ocean

Adult turkey vulture (Cathartes aura) feeding near a California sea lion (Zalophus californianus) carcass on Los Islotes in Gulf of California (Sea of Cortez), Mexico.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

King penguin (Aptenodytes patagonicus) adult and chick at breeding and nesting colony at Salisbury Plains in the Bay of Isles, South Georgia, Southern Ocean.

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA

Adult female California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico