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Green sea turtle (Chelonia mydas), feeding on the sand 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

Green sea turtle (Chelonia mydas), feeding on the sand 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

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

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Caribbean spiny lobster (Panulirus argus), underwater at Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Caribbean land hermit crab (Coenobita clypeatus), Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), with snorkeler near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Brassy chubs (Kyphosus vaigiensis), being fed by boat operators inside the Mesoamerican Barrier Reef, Belize

Brassy chubs (Kyphosus vaigiensis), being fed by boat operators inside the Mesoamerican Barrier Reef, Belize

Christmas tree worms (Spirobranchus giganteus), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

A tube anemone grows on a sandy seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

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.

Detail of a colonial tunicate growing on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A Papuan scorpionfish (Scorpaenopsis papuensis) lies on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

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

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

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

Snorkeler with moon jellyfish (Aurelia sp), in Jellyfish Lake, located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

Underwater view of the reef along the circumference of the Great Blue Hole on Lighthouse Reef, UNESCO, Belize

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

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Mangrove snappers (Lutjanus griseus), schooling in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing 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

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

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

An adult peacock mantis (Odontodactylus scyllarus), in the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

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

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

Snorkeler with moon jellyfish (Aurelia sp), in Jellyfish Lake, located on Eil Malk island, Rock Islands, Palau, Micronesia, Pacific

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), being fed in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Detail of an encrusting sponge growing on a reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

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

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

A venomous scorpionfish is found on a healthy coral reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A diver around a Stylophora species hard coral, on a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives. Indian Ocean, Asia

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

An adult peacock mantis (Odontodactylus scyllarus), in the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

An adult peacock mantis (Odontodactylus scyllarus), in the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

Exotic starfish under the breaking waves in the transparent water of the Indian Ocean, Zanzibar, Tanzania, East Africa, Africa

An adult peacock mantis (Odontodactylus scyllarus), in the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

Giant Tridacna clams, genus Tridacna, in the shallow reefs off Kawe Island, Raja Ampat, Indonesia, Southeast Asia, Asia

A shoal of Blue-striped Snappers (Lutjanus kasmira) swims across a tropical coral reef, in Gaafu Dhaalu atoll, The Maldives, Indian Ocean, Asia

Christmas tree worms (Spirobranchus giganteus) in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

A golden sea squirt (Polycarpa aurata), on the reef off Freewin Wall, near Waigeo Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Giant Tridacna clams, genus Tridacna, in the shallow reefs off the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

Corals in the crystal clear water in the shallow reefs off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

An adult necklace starfish (Fromia monilis), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

An adult Crown-of-Thorns starfish (Acanthaster planci), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

A golden sea squirt (Polycarpa aurata), on the reef off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Above/below view of the shallow mangroves off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Corals in the crystal clear water in the shallow reefs off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

A sea fan from the genus Acanthogorgia, on Freewin Wall, near Waigeo Island, Raja Ampat, Indonesia, Southeast Asia, Asia

An adult banded sea krait (Laticauda colubrina), off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

A common mushroom coral (Fungia fungites), at night in the rubble on Kawe Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Corals in the crystal clear water in the shallow reefs off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Encrusting sponges, soft corals, and other invertabrates living on pilings on Arborek Reef, Raja Ampa, Indonesia, Southeast Asia, Asia

Bennett's feather star (Oxycomanthus bennetti), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

Giant Tridacna clams, genus Tridacna, in the shallow reefs off Port Airboret, Raja Ampat, Indonesia, Southeast Asia, Asia

Giant Tridacna clams, genus Tridacna, in the shallow reefs off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Giant Tridacna clams, genus Tridacna, in the shallow reefs off the Equator Islands, Raja Ampat, Indonesia, Southeast Asia, Asia

Christmas tree worms (Spirobranchus giganteus), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

Corals in the crystal clear water in the shallow reefs off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Woman showing a yellow starfish underwater in the tropical lagoon, Zanzibar, Tanzania, East Africa, Africa

An adult painted spiny lobster (Panuluris versicolor), hunting off Bangka Island, off the northeastern tip of Sulawesi, Indonesia, Southeast Asia, Asia

Bennett's feather star (Oxycomanthus bennetti), in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia