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Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Adult Galapagos penguin (Spheniscus mendiculus) underwater, Bartolome Island, Galapagos Islands, Ecuador, South America

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

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Glassfish (Parapriacanthus ransonneti) shoal, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

California sea lion (Zalophus californianus) underwater with snorkeler at Los Islotes, Baja California Sur, Mexico, North America

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

Underwater image of the inner lagoon of Apataki coral atoll, Palliser Islands, Tuamotus, French Polynesia, South Pacific, Pacific

Flightless cormorant (Nannopterum harrisi) hunting underwater, Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Adult blacktip reef shark (Carcharhinus melanopterus) underwater at Toau, Tuamotus, French Polynesia, South Pacific, Pacific

Colorful reef fish in the inner lagoon at Toau Atoll, Tuamotus, French Polynesia, South Pacific, Pacific

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

Orbicular batfish (Platax orbicularis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Juvenile whale shark (Rhincodon typus) with a common remora attached in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

Yellow-dotted trevally (Carangoides fulvoguttatus) shoal, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

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

Marine Iguana feeding at Sea, Amblyrhynchus cristatus, Cabo Douglas, Fernandina Island, Galapagos, Ecuador

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

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

Curious young California sea lion (Zalophus californianus) with snorkeler underwater at Los Islotes, Baja California Sur, Mexico, North America

An adult southern fulmar (Fulmarus glacialoides), feeding underwater on krill in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

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

A curious male leopard seal (Hydrurga leptonyx), underwater at Monroe Island, South Orkney Islands, Antarctica, Polar Regions

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

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.

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.

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

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 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 pair of robust ghost pipefish (Solenostomus cyanopterus) hover above the seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A pink anemonefish (Amphiprion perideraion) swims among the tentacles of its host anemone in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A blue line grouper (Cephalopholis formosa) swims on a 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 pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, 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.

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

A young humpback whale, Megaptera novaeangliae, breaches out of the blue waters of the Caribbean Sea.

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

Beams of light descend through a wooden jetty in the Dampier Strait, Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A school of lined sweetlips, Plectorhinchus lineatus, swim above a healthy coral reef in Raja Ampat, Indonesia.

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 hawksbill sea turtle, Eretmochelys imbricata, lays on 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 colorful ornate ghost pipefish, Solenostomus paradoxus, hovers over a coral reef 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 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.

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.

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.