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California gray whale calf (Eschrictius robustus), being touched by tourist in San Ignacio Lagoon, Baja California, Mexico, North America

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

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

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

Adult fin whale (Balaenoptera physalus) carcass in Holmabukta off the northwest of the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

A rare sighting of an adult blue whale (Balaenoptera musculus) sub-surface feeding in the Svalbard Archipelago, Norway

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

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

Anemonefish in anemone on underwater reef on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

Hard and soft corals and tridacna clam on underwater reef on Jaco Island, Timor Sea, East Timor, Southeast Asia, Asia

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

Hard and soft corals and reef fish underwater 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

Hard and soft corals and giant clam underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A profusion of hard and soft coral with a giant clam underwater on Tengah Besar 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

A school of batfish (Platax orbicularis) on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Humbug Dascyllus (Dascyllus aruanus), in stag horn coral head on Sebayur 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

Hard and soft corals and sea star underwater 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 profusion of coral and reef fish on Batu Bolong, Komodo Island National Park, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), 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

A school of razorfish (Aeoliscus strigatus), head down posture on the 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

Porcupinefish (Diodon hystrix) at night on house reef at 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

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

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

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

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

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

False clown anemonefish (Amphiprion ocellaris), Sebayur Island, Komodo Island National Park, 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 profusion of baitfish underwater on 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

Exotic starfish under the breaking waves in the transparent water of the Indian Ocean, 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

Galapagos penguins (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