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A flathead fish camouflages itself in the sandy seafloor of Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A lionfish (Pterois volitans) displays its venomous spines in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A colorful crinoid clings to a coral reef slope in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A massive school of bigeye trevally (Caranx sexfasciatus) swims in deep water near Cocos Island, Costa Rica. This remote island is home to an incredible variety of marine life.

Detail of a colorful giant clam (Tridacna squamosa) growing on a reef near Alor in the Lesser Sunda Islands of Indonesia. This remote tropical region is home to extraordinary marine biodiversity. near Alor in the Lesser Sunda Islands of Indonesia.

A snowflake moray eel (Echidna nebulosa) peeks out from a dark hole on a reef in Komodo National Park, Indonesia.

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A broadclub cuttlefish, Sepia latimanus, hovers over a healthy reef on the remote island of Teun in Indonesia's Banda Sea.

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

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

Adult great skua (Stercorarius skua) with recent kill in the Svalbard Archipelago, Norway, Arctic, Europe

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

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

Adult wandering albatross (Diomedea exulans) on the wing near the Antarctic Peninsula, Southern Ocean, Polar Regions

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

Svalbard reindeer (Rangifer tarandus) on the tundra in Varsolbukta, Bellsund, Spitsbergen, Arctic, Norway, Scandinavia, Europe

Adult polar bear (Ursus maritimus) on first year sea ice in Olga Strait, near Edgeoya, Svalbard, Arctic, Norway, Scandinavia, Europe

Adult fin whale (Balaenoptera physalus), dorsal fin detail surfacing off Newport Beach, California, United States of America, North America

By-the-wind sailor (Velella velella), floating on the surface of the sea outside Newport Beach, California, United States of America, North America

By-the-wind sailor (Velella velella), held in a hand without stinging just outside Newport Beach, California, United States of America, North America

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

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

Galapagos sea lion (Zalophus wollebaeki) pup in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Cormorants, Northeast branch of the Beagle Channel, Tierra del Fuego, Patagonia, Chile, South America

Blue-footed boobies (Sula nebouxii), in flight near Isla Salsipuedes, Baja California, Sea of Cortez, Mexico, North America

Blue-footed boobies (Sula nebouxii), on a small islet near Isla Salsipuedes, Baja California, Sea of Cortez, Mexico, North America

Yellow-footed gull (Larus livens), eggs in nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

Brown booby (Sula leucogaster), in flight off small islet north of Isla San Marcos, Baja California Sur, Sea of Cortez, Mexico, North America

Humpback whale (Megaptera novaeangliae), surfacing off San Jose del Cabo, Baja California Sur, Mexico, North America

An injured bull California sea lion (Zalophus californianus), hauled out on Isla San Pedro Martir, Sea of Cortez, Mexico, North America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

Adult brown pelicans (Pelecanus occidentalis), plunge diving for fish, Isla Carmen, Baja California Sur, Mexico, North America

An adult bull killer whale (Orcinus orca) surfacing in Johnstone Strait, British Columbia, Canada, Pacific Ocean, North America

Adelie penguins (Pygoscelis adeliae) tobogganing to the sea at Brown Bluff, Antarctica, Southern Ocean, Polar Regions

Gentoo penguins (Pygoscelis Papua) afloat on an iceberg in the Antarctic peninsula, Antarctica, Polar Regions

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Gentoo penguin (Pygoscelis papua) colony, Cuverville Island, Errera Channel, Danco Coast, Antarctic Peninsula, Antarctica, Polar Regions

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

A mother sea otter (Enhydra lutris) with her pup in Reid Inlet, Glacier Bay National Park, Southeast Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Grey seals and Common (Harbour) seals (Phoca vitulina) on beach at Blakeney Point, Norfolk, England, United Kingdom, Europe

King penguin (Aptenodytes patagonicus) breeding colony at Salisbury Plain, South Georgia, Polar Regions

Southern Rockhopper penguin rookery (Eudyptes chrysocome), New Island, Falkland Islands, British Overseas Territory, South America

Solitary dog walker at sunrise on the beach at low tide in Walberswick on the east coast of England, Suffolk, England, United Kingdom, Europe

California gray whale (Eschrichtius robustus), with whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

An adult humpback whale (Megaptera novaeangliae), flukes-up dive near boat in Kenai Fjords National Park, Alaska, United States of America, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

A mother polar bear (Ursus maritimus), with two cubs of the year foraging for food at Cape Brewster, Greenland, Polar Regions

Polar bear cubs of the year (Ursus maritimus), foraging for food with mother nearby, Cape Brewster, Greenland, Polar Regions

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

Bantham Sand beach across the River Avon seen from Bigbury-on-Sea, Bantham, South Hams district, Devon, England, United Kingdom, Europe

Chinstrap penguins (Pygoscelis antarcticus), diving off a cliff in to the sea, Zavodovski Island, South Sandwich Islands, South Atlantic, Polar Regions

Over a million chinstrap penguins (Pygoscelis antarcticus), on Zavodovski Island, South Sandwich Islands, South Atlantic, Polar Regions

King penguin (Aptenodytes patagonicus), breeding colony at Gold Harbour, South Georgia, South Atlantic, Polar Regions

Adult olive-headed sea snake (Hydrophis major), swimming on Ningaloo Reef, Western Australia, Australia, Pacific

Adult male killer whale (Orcinus orca), surfacing at sunset on Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), adult breaching on Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), adult breaching on Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), adult breaching on Ningaloo Reef, Western Australia, Australia, Pacific