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Antarctic fur seal pups (Arctocephalus gazella), playing underwater in Stromness Harbor, South Georgia, South Atlantic, Polar Regions

A pair of humpback whales (Megaptera novaeangliae), underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

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

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

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

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

Adult whale shark (Rhincodon typus), underwater on Ningaloo Reef, Western Australia, Australia, Pacific

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

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

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

Adult false killer whales (Pseudorca crassidens), surfacing on Ningaloo Reef, Western Australia, Australia, Pacific

Adult humpback whale (Megaptera novaeangliae), flukes up dive on Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whales (Megaptera novaeangliae), swimming underwater on Ningaloo Reef, Western Australia, Australia, Pacific

A pod of killer whales (Orcinus orca), attacking a humpback whale on Ningaloo Reef, Western Australia, Australia, Pacific

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

A pod of mammal eating killer whales (Orcinus orca), surfacing on Ningaloo Reef, Western Australia, Australia, Pacific

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

Humpback whale (Megaptera novaeangliae), mother and calf underwater, Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), mother and calf underwater, Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), adult flukes up dive on Ningaloo Reef, Western Australia, Australia, Pacific

Mother and son swimming in the crystal sea next to a pink sand beach, aerial view, Barbuda, Antigua and Barbuda, West Indies, Caribbean, Central America

View of Paralia Megali Ammos in Skiathos Town, Skiathos Island, Sporades Islands, Greek Islands, Greece, Europe

Aerial view of tourists bathing in the Giola, a natural pool on Thassos island, Greek Islands, Greece, Europe

An adult blue whale (Balaenoptera musculus) flukes-up dive in Monterey Bay National Marine Sanctuary, California, United States of America, North America

An adult blue whale (Balaenoptera musculus) flukes-up dive in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), tail throw in Monterey Bay National Marine Sanctuary, California, United States of America, North America

An adult blue whale (Balaenoptera musculus) flukes-up dive in Monterey Bay National Marine Sanctuary, California, United States of America, North America

An adult bowhead whale (Balaena mysticetus), flukes-up dive off Somerset Island, Nunavut, Canada, North America

The flukes of an adult female sperm whale (Physeter macrocephalus) swimming underwater, Roseau, Dominica, Windward Islands, West Indies, Caribbean, Central America

The flukes of an adult female sperm whale (Physeter macrocephalus) swimming underwater, Roseau, Dominica, Windward Islands, West Indies, Caribbean, Central America

An adult humpback whale (Megaptera novaeangliae), flukes up dive amongst the icebergs in Ilulissat, Greenland, Denmark, Polar Regions

Crowded beach on a sunny day with people sunbathing and swimming, colorful umbrellas, and a pier in the distance in Bournemouth, Dorset, England, United Kingdom, Europe

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

An adult bluestreak goby (Valenciennea strigata), on the reef off Kri Island, Raja Ampat, Indonesia, Southeast Asia

A school of striped catfish (Plotosus lineatus), off the reef on Bangka Island, near Manado, Indonesia, Southeast Asia

A school of round batfish (Platax orbicularis), off the reef on Bangka Island, near Manado, Indonesia, Southeast Asia

A school of bigeye trevally (Caranx sexfasciatus), Village Reef, Raja Ampat, Indonesia, Southeast Asia

A school of orbicular cardinalfish (Sphaeramia orbicularis), in the mangroves off Wohof Island, Raja Ampat, Indonesia, Southeast Asia

An adult snowflake moray eel (Echidna nebulosa), on the reef off Port Airboret, Raja Ampat, Indonesia, Southeast Asia

A school of striped eel catfish (Plotosus lineatus), swimming on the reef off Bangka Island, Indonesia, Southeast Asia

A pair of spine-cheek clownfish (Amphiprion biaculeatus), Pulau Gam night snorkel off Wohof Island, Raja Ampat, Indonesia, Southeast Asia

A pair of spine-cheek clownfish (Amphiprion biaculeatus), tucked into an anemone off Wohof Island, Raja Ampat, Indonesia, Southeast Asia

A school of jointed razorfish (Aeoliscus strigatus), in their usual head down formation, off Bangka Island, Indonesia, Southeast Asia, Asia

A school of jointed razorfish (Aeoliscus strigatus) in their usual head down formation, off Bangka Island, Indonesia, Southeast Asia, Asia

A school of razor surgeonfish (Prionurus laticlavius), on the reef at Fernandina Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

View of man snorkeling in the Red Sea near Sahl Hasheesh, Sahl Hasheesh, Hurghada, Red Sea Governorate, Egypt, North Africa, Africa

Upmarket Camps Bay draws crowds to its namesake beach, known for fine white sand, natural rock swimming pool and views of the Twelve Apostles mountains, Cape Town, Western Cape, South Africa, Africa

A pod of Indo-Pacific bottlenose dolphin (Tursiops aduncus), off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

A mother sea otter (Enhydra lutris) eating a Dungeness crab with her pup in the Inian Islands, Southeast Alaska, United States of America, North America

An adult specklefin grouper ( Epinephelus ongus, off Port Airboret, Raja Ampat, Indonesia, Southeast Asia, Asia

Adult bigeye snapper (Lutjanus lutjanus) schooling off Port Airboret, Raja Ampat, Indonesia, Southeast Asia, Asia

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.

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.

An unidentified moray eel (Gymnothorax sp.) swims over a sandy seafloor in Komodo National Park, Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a healthy reef in the Lesser Sunda Islands of Indonesia.

A large roughtail stingray, Dasyatis centroura, lays on the seagrass-covered seafloor of Turneffe Atoll off the coast of Belize. This reef is part of the massive Mesoamerican Reef System in the Caribbean Sea, the second largest barrier reef on Earth.

A colorful warty frogfish, Antennarius maculatus, yawns as it waits for prey to swim close by in Komodo National Park, Indonesia.

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

Adult Peale's Dolphin (Lagenorhynchus australis), bow-riding near New Island in the Falkland Islands, South America

View of beach scene and boat on the sea at Porto Vathy, Makriammos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Woman swimming at the small beach of Perna inlet, Palmizana, St. Clement island, Hell's Islands (Pakleni), Hvar city, Hvar island, Croatia, Southeast Europe

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

Adult green sea turtle (Chelonia mydas agassizii) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus wollebaeki) underwater with Galapagos penguin in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

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

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

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