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Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

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

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

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

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater 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

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

Spinner dolphin pod (Stenella longirostris), swimming near the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

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

Haenyeo women, famous for diving into their eighties and holding their breath for up to two minutes, free-diving for seafood and crustaceans, Jeju Island, South Korea, Asia

A small pod of Type B killer whales (Orcinus nanus) just outside Duse Bay in the Weddell Sea, Antarctica, Polar Regions

Kyphosus sectatrix seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Stingray seen during Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Whale shark, Madagascar, Indian Ocean, Africa

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

Underwater view of Jellyfish Lake, a marine lake located on Eil Malk Island, Rock Islands, Palau, Micronesia, Pacific

Golden jellyfish (Mastigias papua etpisoni), in Jellyfish Lake, a marine lake located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

Mudskipper, Tampa Aquarium, United States of America

Underwater marine life on coral reefs, Thailand

Horse-eye jacks (Caranx latus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), with boat in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus), with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Southern stingray (Hypanus americanus) with snorkeler in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Spotted eagle ray (Aetobatus narinari), Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with sharksucker, Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), on the reef near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkelers near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

West Indian manatee (Trichechus manatus), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), feeding on the sand near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lion (Eumetopias jubatus) close-up eating a halibut in Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, Southeastern Alaska, United States of America

Adult sea otter (Enhydra lutris kenyoni) in kelp bed in Inian Pass, Southeastern Alaska, United States of America

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

Young Spotted Eagle Ray (Aetobatus narinari) among mangrove trees in shallow water, Bermuda

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

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

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

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

Couple scuba diving while exploring the coral reefs of Bonaire, Netherlands Antilles, Caribbean, Central America

Whale shark (Rhincodon typus) underwater with snorkelers off El Mogote, near La Paz, Baja California Sur, Mexico, North America

Adult killer whale (Orcinus orca) surfacing with kelp on its flukes in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

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

A school of big-eye jacks (Caranx sexfasciatus) above a coral reef in the Solomon Islands. This region is known for its healthy fish populations.

A large reef manta ray (Mobula alfredi) swims through clear water in 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 pair of spotted eagle rays (Aetobatus narinari) swim over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

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.

A large map pufferfish (Arothron mappa) swims along a reef in Komodo National Park, Indonesia.

An ornate ghost pipefish (Solenostomus paradoxus) hovers above a coral reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a beautiful set of corals growing near Alor in the Lesser Sunda Islands of Indonesia.

A snorkeler swims above a beautiful reef near Alor in the Lesser Sunda Islands of Indonesia.

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

A blue line grouper (Cephalopholis formosa) swims on a reef in the Lesser Sunda Islands of Indonesia.

A manta ray (Mobula alfredi) swimming near a cleaning station in Raja Ampat, Indonesia.

A juvenile many-spotted sweetlips (Plectorhinchus chaetodonoides) feeds on a small fish near the seafloor in Lembeh Strait, Indonesia.

A lionfish (Pterois volitans) hunts for prey in a seagrass meadow in the Banda Islands of eastern Indonesia.

Colorful anthias fish swim above a beautiful coral reef in Alor, Indonesia.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

An ornate ghost pipefish, Solenostomus paradoxus, hovers near a hydroid on a reef in Raja Ampat, Indonesia.

A false clownfish, Amphiprion ocellaris, swims among the tentacles of its host anemone in Raja Ampat, Indonesia.

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A hawksbill sea turtle, Eretmochelys imbricata, swims over a beautiful reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A Wonderpus, Wunderpus photogenicus, hunts for prey on the sandy seafloor in Lembeh Strait, Indonesia.

A school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.

Humbug damselfish hover above protective corals in Raja Ampat, Indonesia.

A thick school of yellow-striped scad swims below a jetty amid the tropical islands of Raja Ampat, Indonesia.

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

A small, well-camouflaged cuttlefish, Sepia sp., hovers on a rocky seafloor in the Banda Sea, Indonesia.

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

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A green sea turtle swims by a reef under the sun, North Sulawesi, Indonesia.

A black manta ray, Mobula alfredi, visits a cleaning station on a reef in Komodo National Park, Indonesia.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.