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

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Northern (Steller) sea lion (Eumetopias jubatus) fishing on the flood tide in Inian Pass, Southeastern Alaska, United States of America

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

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, 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 sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

Northern (Steller) sea lions (Eumetopias jubatus) hauled out on South Marble Island, Glacier Bay National Park, 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) tail throw among feeding whales in Southeast Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

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

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

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

A view of the tidewater glacier in Isbukta (Ice Bay) on the western side of Spitsbergen Island, Svalbard Archipelago, Norway

A view of Krossfjorden (Cross Fjord) on the northwestern side of Spitsbergen Island in the Svalbard Archipelago, Norway

An adult ivory gull (Pagophila eburnea) on ice near Monaco Glacier on the north side of SpitsBergen, Vestland, Norway

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Adult humpback whale (Megaptera novaeangliae), surfacing near researchers in Zodiac at sunset, Iceland

California sea lion bulls (Zalophus californianus), hauled out on a small islet off San Marcos Island, Sea of Cortez, Mexico, North America

David Keanes, owner of Connemara Oyster Farm with oyster-bags, Ballinakill Bay, Letterfrack, Connemara, County Galway, Connacht, Republic of Ireland

Soft leather corals grow in the shallow waters in the Solomon Islands, Melanesia. This region, in the eastern part of the Coral Triangle, harbors spectacular marine biodiversity and is known for its beautiful reefs.

Rock shag (Phalacrocorax magellanicus), pair exhibiting courtship behavior near New Island in the Falkland Islands, South America

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) cleaning itself in glacier run off at Stromness Bay, South Georgia, Polar Regions

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) on tussac at Salisbury Plain on South Georgia Island, Polar Regions

Southern elephant seal (Mirounga leonina) pup nursing at Gold Harbour on South Georgia Island in the Southern Ocean, Polar Regions

Adult Magellanic penguin (Spheniscus magellanicus) at a breeding site on Peninsula Valdez, Patagonia, Argentina, South America

Glacial iceberg detail from ice calved off the South Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America, North America

Adult female sea otter (Enhydra lutris kenyoni) eating urchins she has gathered off the sea floor in Inian Pass, Southeastern Alaska, Pacific Ocean, United States of America, North America

Chalk cliffs with arch and l'Aiguille (the Needle), Etretat, Seine-Maritime department, Normandy region, France, Europe

A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Protected historic site of Lucica, a former fishermen's settlement near Lastovo town, Lastovo island, Croatia, Southeast Europe

Woman sitting on rocks at a creek of Mrcara islet at the north-west of Lastovo island, Croatia, Southeast Europe

Adult Dall's porpoise (Phocoenoides dalli) surfacing with characteristic rooster tail splash in Johnstone Strait, British Columbia, Canada, North America

Adult dovekie (Little Auk) (Alle alle) at their breeding site amongst scree slopes at Rubini Rock, Tikhaya Bay, Hooker Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult black-legged kittiwake (Rissa tridactyla) in aerial combat against another kittiwake near Alexander Island, Russia, Eurasia

A young killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America

Tabular icebergs in and around the Weddell Sea during the summer months, Antarctica, Southern Ocean, Polar Regions

The Grandes Rocques, Island of Guernsey, Bailiwick of Guernsey, British Crown dependency, English Channel, Europe

Adult kelp gull (Larus dominicanus), nesting on lichen covered rocks on Half Moon Island in Antarctica, Southern Ocean, Polar Regions

Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult black-legged kittiwakes (Rissa tridactyla) in flight in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) in flight near breeding and nesting site at Cape Fanshawe in Svalbard, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the beach in the Svalbard Archipelago, Norway, Arctic, Europe

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Paddler on a standup paddle board (SUP) off the far northwest coast of Scotland and the cliffs of Handa Island, Sutherland, Highlands, Scotland, United Kingdom, Europe

View of the Argentine base Almirante Brown, named after Guillermo Brown of the Argentine Navy, Paradise Bay, Antarctica, Polar Regions

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on algae at low tide in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Impressive panoramic view over the Rock of Gibraltar and the peninsula, looking over the white cliffs onto the Mediterranean Sea and mainland Spain, Gibraltar, Europe

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

Guest from the Lindblad Expedition ship National Geographic Explorer holding ice in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer near Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations near a feeding sea otter in Southeast Alaska, United States of America, North America

The Lindblad Expedition ship National Geographic Explorer pushing through ice in the Svalbard Archipelago, Norway, Arctic, Europe

Fish trawler between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Little boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of a boat between the icebergs of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Adult brown booby (Sula leucogaster), on post on the northeast coast of Viti Levu, Fiji, South Pacific, Pacific