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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.

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

Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean

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

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

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 California Gray Whale (Eschrichtius robustus) breaching in Magdalena Bay, 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 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

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

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

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

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador

Adult fin whale (Balaenoptera physalus) carcass in Holmabukta off the northwest side of Spitsbergen in the Svalbard Archipelago, Norway

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Island Archipelago, Ecuador

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern 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.

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island in the Southern Ocean

Humpback whale (Megaptera novaeangliae) tail throw in the lower Gulf of California (Sea of Cortez), Baja California Sur, Mexico.

Adult California Gray Whale (Eschrichtius robustus) breaching in Magdalena Bay, Baja California Sur, Mexico

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Island Archipelago, Ecuador

Dead southern elephant seal (Mirounga leonina) pup being eaten by an Antarctic skua on South Georgia Island in the Southern Ocean

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

Offshore type bottlenose dolphins (Tursiops truncatus) surfacing near Porto Novo, Santo Antao, Cape Verde Islands, Atlantic 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

California gray whale (Eschrichtius robustus) calf with excited whale watchers in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean

California gray whale (Eschrichtius robustus) calf with excited whale watchers in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the continental shelf, Spitsbergen, Svalbard Archipelago, Norway

Adult surf scoter (Melanitta perspicillata) taking flight in Glacier Bay National Park, Southeast Alaska, USA, Pacific Ocean.

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador

Adult male walrus (Odobenus rosmarus rosmarus) on ice floes near Moffen Island, Svalbard Archipelago in the Barents Sea, Norway

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

Adult Fin Whale (Balaenoptera physalus) power lunging in the Drake Passage between South America and the Antarctic Peninsula, Southern Ocean

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

Adult Galapagos penguin (Spheniscus mendiculus) split view underwater in the Galapagos Island Group, Ecuador

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

Adult White-beaked Dolphin (Lagenorhynchus albirostris) feeding in the rich waters off the northwest side of Spitsbergen in the Svalbard Archipelago, Norway

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the continental shelf on the west side of Spitsbergen Island in the Barents Sea, Norway

Antarctic Fur Seal (Arctocephalus gazella) during snow storm at Brown Bluff on the Antarctic Peninsula, Antarctica, Southern Ocean

Walrus skull (Odobenus rosmarus rosmarus) on the tundra off Freemansundet in the Svalbard Archipelago in the Barents Sea, Norway

California Gray Whale (Eschrichtius robustus) underwater in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

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

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a small skate in Southeastern Alaska, USA

Adult Antarctic Minke Whale (Balaenoptera bonaerensis), also known as the Southern Minke Whale, breaching near the Antarctic Peninsula

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

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

Adult Peale's Dolphin (Lagenorhynchus australis) bow-riding in the Falkland Islands, South Atlantic Ocean

Steam coming from the bodies of northern (Steller) sea lion (Eumetopias jubatus) colony on the South Marble Islands inside Glacier Bay National Park, southeastern Alaska

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

Adult Galapagos penguin (Spheniscus mendiculus) split view underwater in the Galapagos Island Group, Ecuador

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, Ecuador

Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Group, Ecuador. Pacific Ocean.

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Island Archipelago, Ecuador

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador

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

Humpback whale (Megaptera novaeangliae) spy-hopping near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador

Humpback whale (Megaptera novaeangliae) surfacing near Zodiac near the Antarctic Peninsula, Antarctica, Southern Ocean

Adult Galapagos penguin (Spheniscus mendiculus) hunting fish underwater in the Galapagos Island Group, Ecuador