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A pair of Ceylon nudibranchs (Gymnodoris ceylonica) mate on a sandy slope in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.
A spine-cheeked anemonefish (Premnas biaculeatus) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia.
A yellow stingray (Urobatis jamaicensis) lays on the sandy seafloor of Turneffe Atoll in Belize. This small and beautiful elasmobranch ranges throughout the Caribbean Sea.
A school of juvenile striped eel catfish (Plotosus lineatus) swims over the seafloor in Komodo National Park, Indonesia.
Colorful chocolate chip starfish (Protoreaster nodosus) cling to the seafloor of a seagrass meadow in Komodo National Park, Indonesia.
A predatory stonefish (Synanceia verrucosa) lies camouflaged in the sandy seafloor of Komodo National Park, Indonesia. This is the most venomous fish on Earth but uses its venom only for defensive purposes.
A well-camouflaged yellow stingray, Urobatis jamaicensis, swims over a shallow seagrass meadow growing within Turneffe Atoll's lagoon in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth
Soft coral colonies, Sinularia sp., thrive on a reef found among the remote, tropical islands of Raja Ampat, Indonesia.
A beautiful coral reef thrives in a remote part of Raja Ampat, Indonesia.
Bright beams of sunlight descend into the shadows of a blue water mangrove forest in Raja Ampat, Indonesia.
A Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.
A well-camouflaged ornate ghost pipefish, Solenostomus paradoxus, hovers over a reef in Komodo National Park, Indonesia.
A well-camouflaged ornate ghost pipefish, Solenostomus paradoxus, hovers over a reef in Komodo National Park, Indonesia.
A beautiful coral reef thrives around an island in a remote part of Raja Ampat, Indonesia.
A brightly colored soft coral adorns prop roots in a blue water mangrove forest in Raja Ampat, Indonesia.
A colorful soft coral adorns a giant clam, Tridacna sp., growing on a healthy reef in Raja Ampat, Indonesia.
A soft coral and large gorgonian thrive on a beautiful coral reef in Raja Ampat, Indonesia.
California sea lions (Zalophus californianus), grouped together on a channel marker off Newport Beach, California, United States of America, North America
A beautiful coral reef thrives in shallow water in Indonesia's Ceram Sea.
A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.
A very small (2-3mm) nudibranch in its natural habitat, Tulamben, Bali, Indonesia.
Turtle gazes at its reflection under the USS Kittiwake shipwreck in Grand Cayman, Cayman Islands.
Reef squid swimming, Anilao, Philippines.
A juvenile broadclub cuttlefish about the size of a human thumb, Anilao, Philippines.
A nudibranch shares a home in a bottle with a lemon goby, Anilao, Philippines.
A trio of rays swim down a sandy gulch in the Indian Ocean, Maldives.
Cattle on the beach at Qeparo, on the Ionian coast, Albania, Europe
Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions
Puffin, Farne Islands, Northumberland, England, United Kingdom, Europe
Polar bear (Ursus maritimus), mother and two cubs on an ice floe in the fog in Davis Strait, Nunavut, Canada, North America
Southern right whale (Eubalaena australis) adult female flukes-up to catch the wind in Puerto Pyramides, Argentina, South America
A young killer whale (Orcinus orca) surfacing in Glacier Bay National Park, Southeast Alaska, United States of America, Pacific Ocean, North America
Humpback whale (Megaptera novaeangliae) calf playing at the surface.
Two oceanic manta rays (Mobula birostris) coming in to a cleaning station, Maldives.
A pygmy goby, New Ireland, Papua New Guinea.
Spiny lobsters under an overhang in Cozumel, Mexico.
Red lionfish in Malaysia.
Freckled goatfish in Malaysia.
Stingrays swim through the deeper waters of Stingray City in Grand Cayman, Cayman Islands.
Oxeye scad in Raja Ampat, Indonesia.
Christmas tree worm in Raja Ampat, Indonesia.
Peacock flounder in Cane Bay in St. Croix, U.S. Virgin Islands.
Shrimp on bubble coral, Indonesia.
Black and white banded Sea Krait, Indonesia.
Lizardfish, Indonesia.
Cuttlefish, Indonesia.
An adult polar bear (Ursus maritimus) on ice floe under bright sun burst in the Svalbard Archipelago, Norway, Arctic, Europe
Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America
Adult Swallow-tailed gull (Creagrus furcatus) in flight in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Turtle on a beach, Bird Island, Republic of Seychelles, Indian Ocean, Africa
Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America
Adult yellow-nosed albatross (Thalassarche chlorohynchos) in flight near the Tristan da Cunha Group, South Atlantic Ocean
Antarctic fur seal pup (Arctocephalus gazella) playing in the kelp on Prion Island in the Bay of Isles on South Georgia, Polar Regions
Adult black-browed albatross (Thalassarche melanophrys) in Elsehul on South Georgia, Southern Ocean, Polar Regions
Killer whale female calf (Orcinus orca), breaching at sunset off Isla San Jose, 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
Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America
Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America
Mother walrus (Odobenus rosmarus) with calf hauled out on an ice floe near Storoya, Svalbard, Norway, Europe
An argonaut (Genus Argonauta), a group of pelagic octopuses. Baja California, Sea of Cortez, Mexico, North America
Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America
Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America
Shark in Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe
Adult sanderling (Calidris alba) feeding on the tidal flat in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Adult Swallow-tailed gull (Creagrus furcatus) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America
Antarctic fur seal bull (Arctocephalus gazella) on South Georgia, Southern Ocean, Polar Regions
King penguin (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions
Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean
Giant Petrel (macronectes giganteus), Tierra del Fuego, Patagonia, Chile, South America
Yellow-footed gull (Larus livens), on its nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America
Double-crested cormorant (Nannopterum auritum), taking flight, Concepcion Bay, Baja California Sur, Sea of Cortez, Mexico, North America
Heermann's gull (Larus heermanni), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North Anerica
Heermann's gull (Larus heermanni), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North Anerica
Heermann's gulls (Larus heermanni), feeding on the beach at Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America
Eared grebes (Podiceps nigricollis), in Puerto Refugio, Angel de la Guarda Island, Baja California, Sea of Cortez, Mexico, North America
Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America
Humpback whale (Megaptera novaeangliae), flukes up dive on the Silver Banks in the Dominican Republic, Greater Antilles, Caribbean, Central America
Seagull at the Paradise Beach, Tulum, Quintana Roo State, Mexico
Killer whale pod (Orcinus orca), ad tourist off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America
Antarctic shag spreading wings with wing-shaped iceberg, Antarctica, Polar Regions
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
Black-browed albatross (Thalassarche melanophrys) in flight on New Island in the Falkland Islands
An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America
Galapagos sea lion (Zalophus wollebaeki), pup in Puerto Egas, Santiago Island, Galapagos, Ecuador, South America
Curious California sea lions (Zalophus californianus), underwater at Los Islotes, Baja California Sur, Mexico, North America
Seal and seabird look at each other on a rock in the calm sea, near Alert Bay, Inside Passage, British Columbia, Canada, North America
Southern elephant seal bull (Mirounga leoninar), sounding a challenge on the beach at Gold Harbor, South Georgia, Polar Regions
Southern elephant seal bull (Mirounga leoninar), in the tussah grass at Salisbury Plain, South Georgia, Polar Regions
Whale watcher with California gray whale (Eschrichtius robustus), San Ignacio Lagoon, Baja California Sur, Mexico, North America
Juvenile yellow-footed gull (Larus livens), eating a goatfish, Isla San Ildefonso, Baja California, Mexico, North America
Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America
A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America
Antarctic shag (Leucocarbo bransfieldensis) in breeding plumage, Barrientos Island, Antarctica, Polar Regions
Black-browed albatross (Thalassarche melanophris), in flight in Drake Passage, Antarctica, Polar Regions
Unloading the morning's catch of fish, Dhanushkodi, Tamil Nadu, India, Asia