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Adelie penguin (Pygoscelis adeliae) near the Antarctic Peninsula, Antarctica.
Adult humpback whale (Megaptera novaeangliae) surface lunge-feeding on krill near the Antarctic Peninsula, Antarctica, Southern Ocean
Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico
Adult leopard seal (Hydrurga leptonyx) near the Antarctic Peninsula, Southern Ocean
Bull southern elephant seal (Mirounga leonina) on South Georgia Island in the Southern Ocean
Crabeater seal (Lobodon carcinophaga) hauled out on ice floe near the Antarctic Peninsula, Antarctica
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
Sub-adult bull California sea lions (Zalophus californianus) mock-fighting on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico
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
Adult humpback whale (Megaptera novaeangliae) surfacing in the late evening at Siglufjordur, Iceland
A sighting of adult sei whales (Balaenoptera borealis) in the Drake Passage, 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
An adult humpback whale (Megaptera novaeangliae) head-lunging off Point Adolphus in Icy Strait in Southeast 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
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
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 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.
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
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
Weddell Seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, southern Ocean
Researcher Stephanie Martin takes a blubber biopsy using an arrow fired from a crossbow of an adult blue whale (Balaenoptera musculus), South Orkney islands, Antarctica, Southern Ocean
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
Hawaiian Spinner Dolphin (Stenella longirostris) spinning, possibly to dislodge attached remoras, Lanai, Hawaii, USA, Pacific Ocean
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.
National Geographic photographer Joel Sartore and his wife Kathy kayaking with a leopard seal near Danco Island, Antarctica
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador
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
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
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
An adult humpback whale (Megaptera novaeangliae) breaching off Point Adolphus in Icy Strait in Southeast Alaska, USA. Pacific Ocean
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
A lone adult emperor penguin (Aptenodytes forsteri) and crabeater seal on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica.
Northern (Steller) sea lion (Eumetopias jubatus) colony on the South Marble Islands inside Glacier Bay National Park, southeastern Alaska
Views of Stromness Whaling Station, South Georgia Island in the Southern Ocean, Antarctica
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
Demon Stinger Inimicus didactylus
Adult female leopard seal (Hydrurga leptonyx) killing and eating a juvenile Ad?lie penguin at Brown Bluff near the Antarctic Peninsula, Southern Ocean
Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.
Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.
Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean
Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador
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
Regal Angelfish being cleaned Pygoplites diacanthus