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Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Yellowmargin moray eel (Gymnothorax flavimarginatus) underwater on pink sand beach, Komodo National Park, Komodo Island, Indonesia, Southeast Asia, Asia

Gentoo penguins (Pygoscelis papua), underwater in clear water in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), underwater in clear water in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), underwater in clear water in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Mother polar bear (Ursus maritimus) and cub-of-the-year disputing then allowing a male bear to feed on a fin whale, Svalbard Archipelago, Norway

A mother polar bear (Ursus maritimus), with cub of the year feeding on a fin whale carcass in Holmabukta, Svalbard, Norway

Adult California sea lions (Zalophus californianus) underwater at Los Islotes, Baja California Sur, Mexico, North America

Group of at least eight killer whales (Orcinus orca) surfacing off the coast of the island of Surtsey, southern Iceland

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and sea star underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Brain coral at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idol (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Adult Moorish idols (Zanclus cornutus), Batu Bolong Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Map puffer (Arothron mappa) feeding on sponges on the house reef on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Porcupinefish (Diodon hystrix) on house reef at Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Map puffer (Arothron mappa) feeding on sponges on the house reef on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Yellowmargin moray eel (Gymnothorax flavimarginatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A pair of spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and reef fish underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Curious adult dwarf minke whale (Balaenoptera acutorostrata), underwater near Ribbon 10 Reef, Great Barrier Reef, Queensland, Australia, Pacific

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

Underwater view of giant clam (Tridacna spp), Pixies Bommie, Great Barrier Reef, Queensland, Australia, Pacific

A bright yellow jellyfish (Cotylorhiza tuberculata) in the Mediterranean Sea by the coast of Santa Teresa di Gallura, Sardinia, Italy, Mediterranean, Europe

Aerial view of Le Morne Brabant and the Underwater Waterfall optical illusion and natural phenomena, Mauritius, Indian Ocean, Africa

Antarctica fur seal pup (Arctocephalus gazella), above and below underwater in Husvik Bay, South Georgia, Polar Regions

A school of razorfish (Aeoliscus strigatus), suspended upside down on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of razorfish (Aeoliscus strigatus), suspended upside down on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of striped catfish (Plotosus lineatus) on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) on the reef at Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) mating on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Red crinoid on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Profusion of hard and soft corals on Tengah Kecil Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

An adult snowflake moray (Echidna nebulosa) on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) on the reef at Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Banded sea krait (Laticauda colubrina) searching for food on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Adult broadclub cuttlefish (Sepia latimanus) courtship display, Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Adult spinecheek anemonefish (Premnas biaculeatus), Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

A school of bigeye trevally (Caranx sexfasciatus) on Sebayur Island, Flores Sea, Indonesia, Southeast Asia, Asia

Woman holding two red starfish snorkeling in the turquoise sea in summer, Zanzibar, Tanzania, East Africa, Africa

Man and woman with scuba masks showing starfish swimming underwater in the exotic lagoon, Zanzibar, Tanzania, East Africa, Africa

Mother and son with scuba masks showing red starfish underwater, Zanzibar, Tanzania, East Africa, Africa

Adult bull Galapagos fur seal (Arctocephalus galapagoensis) underwater on Genovesa Island, Galapagos, Ecuador, South America

Pacific green sea turtle (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

Bull Galapagos sea lion (Zalophus wollebaeki) with snorkeler underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) underwater at Santiago Island, Galapagos, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) swimming underwater at Bartolome Island, Galapagos, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus), feeding underwater, Fernandina Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

California gray whale calf (Eschrichtius robustus) underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Juvenile whale shark (Rhincodon typus), underwater near Los Islotes, Baja California Sur, Mexico, North America

A Crown of Thorns starfish (Acanthaster planci), on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A gorgonian sea fan (possibly Echinogorgia species) octocoral on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

A mix of Acropora species hard corals, on a tropical coral reef, around Gaafu Dhaalu atoll, in the south of The Maldives, Indian Ocean, Asia

Whale shark (Rhincodon typus), underwater with snorkeler on Ningaloo Reef, Western Australia, Australia, Pacific

California gray whale (Eschrichtius robustus) mother underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

A beautiful nudibranch (Halgerda batangas) crawls on the sandy seafloor of Lembeh Strait, Indonesia. Lembeh Strait is known for its diverse array of bizarre marine organisms.

Blacktip reef sharks swim just under the surface in the Solomon Islands. This beautiful Melanesian region is known for its spectacular reefs and high marine biodiversity.

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.

False clownfish (Amphiprion ocellaris) swim near their host anemone in Alor, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Rugged limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

A Caribbean electric ray (Narcine bancroftii) lays on the sandy seafloor of Turneffe Atoll off the coast of Belize in the Caribbean Sea. This ray can generate strong electric discharges used to defend themselves or to stun prey.

Fragile corals grow in extremely shallow water in Komodo National Park, Indonesia. This part of the Coral Triangle is known for its high marine biodiversity and is a popular destination for scuba divers and snorkelers.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A spotted eagle ray (Aetobatus narinari) swims over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

Delicate corals grow on a shallow reef near the island of Flores in Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

A bulbed anemone (Entacmaea quadricolor) grows on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A beautiful starfish (Linckia laevigata) lays on a thriving reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

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 pycnogonid, or sea spider, crawls along the mucky seafloor of Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Sunlight sparkles through a table coral (Acropora sp.) in 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 camouflaged horned flathead (Thysanophrys carbunculus) lays hidden on a sandy slope near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A stargazer fish (Uranoscopus sulphureus) camouflages itself in sand in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A lionfish (Pterois volitans) swims along the edge of a beautiful reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

An unusual sea star (Linckia laevigata) clings to a diverse reef near the island of Bangka, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

Colony of tunicates grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A small red starfish clings to coralline algae in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.