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Molting gentoo penguin (Pygoscelis papua) feather detail in Antarctica
Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador
Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding in the Falkland Islands, South Atlantic Ocean
Adult male walrus (Odobenus rosmarus rosmarus) on ice floes near Moffen Island, Barents Sea, Norway
Adult male walrus (Odobenus rosmarus rosmarus) on multi-year ice floes off Bolshoy Island, Barents Sea, Norway
Adult Antarctic Fur Seal (Arctocephalus gazella) killing and then eating a king penguin on the island of South Georgia, southern Atlantic Ocean
Underwater scenes from the Galapagos Island Archipelago, Ecuador
Curious northern (Steller) sea lion (Eumetopias jubatus) colony in Inian Pass near Cross Sound, southeastern Alaska
Curious harbor seal (Phoca vitulina) approaches the Zodiac at Vigur Island in Iceland
Adult male walrus (Odobenus rosmarus rosmarus) on multi-year ice floes off Bolshoy Island, Barents Sea, Norway
Humpback whale (Megaptera novaeangliae) surfacing near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean
Curious northern (Steller) sea lion (Eumetopias jubatus) colony in Inian Pass near Cross Sound, southeastern Alaska
Excited whale watchers on shore see all three resident killer whale (Orcinus orca) pods off Lime Kiln lighthouse, San Juan Island, Washington State, USA
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador
Humpback whale (Megaptera novaeangliae) flukes-up dive near the Antarctic Peninsula, Antarctica, Southern Ocean
Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Island Archipelago, Ecuador
A rare sighting of a lone adult king penguin (Aptenodytes patagonicus), Barrentos Island, South Shetland Islands, Antarctica, Southern 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
Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.
Curious northern (Steller) sea lion (Eumetopias jubatus) colony in Inian Pass near Cross Sound, southeastern Alaska
California sea lion (Zalophus californianus) biting swim fins underwater at Los Islotes (the islets) just outside of La Paz, Baja California Sur in the Gulf of California (Sea of Cortez), Mexico.
A very rare sighting of an adult blue Whale (Balaenoptera musculus) fluke-up dive off the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Barents Sea, Norway
Adult gray seal (Halichoerus grypus) along the Langanes peninsula, Iceland
Adult Fin Whale (Balaenoptera physalus) surfacing in the Scotia Sea
Adult Antarctic Minke Whale (Balaenoptera bonaerensis) surfacing in ice near Larrouy Island on the western side of the Antarctic Peninsula
Green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef, Maui, Hawaii, USA
Crabeater seals (Lobodon carcinophaga) swimming along or hauled out on fast ice floe in Bourgeois Fjord near the Antarctic Peninsula
Adult male walrus (Odobenus rosmarus rosmarus) hauled out on the beach at Poolepynten in Prins Karls Forland, Barents Sea, Norway
Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.
Kayaking with a leopard seal near Danco Island, Antarctica
Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Group, Ecuador. Pacific Ocean.
Adult male walrus (Odobenus rosmarus rosmarus) on ice floes near Moffen Island, Svalbard Archipelago in the Barents Sea, Norway
Adult green sea turtle (Chelonia mydas agassizii) underwater off the west side of Isabela Island in the waters surrounding the Galapagos Island Archipeligo, Ecuador. Pacific Ocean.
Adult humpback whale (Megaptera novaeangliae) breaching in the fjord of Isfjardardjup, Iceland
Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding in the Falkland Islands, South Atlantic Ocean
Adult female leopard seal (Hydrurga leptonyx) with Lindblad Expedition guests at Brown Bluff near the Antarctic Peninsula, Southern Ocean
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Double Sprial Worm Bispira volutacornis
Coral Ctenocella sp
Featherstar Comanthina sp
Saddled Toby Canthigaster coronathus
Diver and Banded Sea Snake Laticauda colubrina
Sea Squirt Clavelina robusta
Mushroom Coral Fungia sp
Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Group, Ecuador. Pacific Ocean.
Sperm Whale (Physeter macrocephalus) surfacing in the mid-riff Island area of the Gulf of California (Sea of Cortez), Sonora, Mexico
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador
A lone adult dwarf minke whale (Balaenoptera acutorostrata subspecies) surfacing in the tropical south Atlantic Ocean
The Leopard seal (Hydrurga leptonyx) is the second largest species of seal in the Antarctic
South American Sea Lion (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Beagle Channel, Argentina
Adult male walrus (Odobenus rosmarus rosmarus), Prins Karls Forland, Svalbard Archipelago, Barents Sea, Norway
Gentoo penguin parent (Pygoscelis papua) with chicks in Antarctica, Southern Ocean
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater near snorkeler in the Galapagos Island Group, Ecuador
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador
Adult Antarctic Minke Whale (Balaenoptera bonaerensis), also known as the Southern Minke Whale, breaching near the Antarctic Peninsula
Adult Galapagos penguin (Spheniscus mendiculus) split view underwater in the Galapagos Island Group, Ecuador
Divers Lisa Trotter and Robert Alexander enter the water with a large, curious, female leopard seal (Hydrurga leptonyx) near Booth Island on the western side of the Antarctic Peninsula, Antarctica
Harp seal (Pagophilus groenlandicus) hauled out on the pack-ice in seas between Iceland and Greenland in the Denmark Strait
Green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef, Maui, Hawaii, USA
Excited whale watchers on shore see all three resident killer whale (Orcinus orca) pods off Lime Kiln lighthouse, San Juan Island, Washington State, USA
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Adult Fin Whale (Balaenoptera physalus) surfacing in the Scotia Sea
California gray whale (Eschrichtius robustus) calf with excited whale watchers in San Ignacio Lagoon, Baja California Sur, Mexico
Northern (Steller) sea lion (Eumetopias jubatus) colony on the South Marble Islands inside Glacier Bay National Park, southeastern Alaska
California Gray Whale (Eschrichtius robustus) with huge wound in San Ignacio Lagoon, Baja Peninsula, Baja California Sur, Mexico
Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA
Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Boring Sponge Cliona celata
Lindblad Expeditions guests on board the National Geographic Explorer with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice, Antarctica
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
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 very rare sighting of an adult blue Whale (Balaenoptera musculus) fluke-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
Feeding tentacles of Sea Cucumber Synapta maculata
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
Adult California Gray Whale (Eschrichtius robustus) breaching in Magdalena Bay, Baja California Sur, Mexico
Adult humpback whale (Megaptera novaeangliae) breaching in the fjord of Isfjardardjup, Iceland
Excited whale watchers on shore see all three resident killer whale (Orcinus orca) pods off Lime Kiln lighthouse, San Juan Island, Washington State, USA
Adult blue whale (Balaenoptera musculus) surfacing (note tiny dorsal fin) in the middle Gulf of California (Sea of Cortez), Baja California Sur, Mexico
Excited whale watchers on shore see all three resident killer whale (Orcinus orca) pods off Lime Kiln lighthouse, San Juan Island, Washington State, USA
Adult male walrus (Odobenus rosmarus rosmarus) on multi-year ice floes off Bolshoy Island, Barents Sea, Norway
Nudibranch Cerastosoma tenue
Southern elephant seal (Mirounga leonina) pup (often called "weaners" once their mothers stop nursing them) on South Georgia Island in the Southern Ocean
South American Sea Lion (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Beagle Channel, Argentina
Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.
Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach near the abandoned whaling station at Stromness Bay on South Georgia Island in the Southern Ocean
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Bull southern elephant seal (Mirounga leonina) on South Georgia Island in the Southern Ocean
The Leopard seal (Hydrurga leptonyx) is the second largest species of seal in the Antarctic
Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.
Kayaking with a leopard seal near Danco Island, Antarctica
Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA
Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador
Offshore type bottlenose dolphins (Tursiops truncatus) surfacing near Porto Novo, Santo Antao, Cape Verde Islands, Atlantic Ocean
Macaroni Penguins (Eudyptes chrysolophus) in Elsehul Bay on South Georgia Island in the Southern Ocean