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A common spiny lobster backs his way into the protection of the reef, Bonaire, Caribbean Netherlands.

Scuba diver on her underwater propulsion vehicle getting a close-up look at an upside-down jellyfish, Bonaire, Caribbean Netherlands.

A large group of purple tube sponge sits high on the reef, Bonaire, Caribbean Netherlands.The Hilma Hooker Shipwreck is visible in the background.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

The hawksbill sea turtle (Eretmochelys imbricata) swims in the waters off the coast of Bonaire, Caribbean Netherlands. The hawksbill is a critically endangered sea turtle belonging to the family Cheloniidae.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, feeding on soft coral, side view, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Three giant oceanic manta rays (Mobula birostris) circling at a cleaning station, South Ari Atoll, Maldives.

Hawksbill sea turtle (Eretmochelys imbricata), a critically endangered species, frontal view, South Ari Atoll, Maldives.

Head on view showing cerata on an aeolid nudibranch, Pteraeolidia ianthina, in Komodo National Park, Indonesia.

Ladybug amphipod, Cyproidea species, side view, taken at Cannibal Rock, Komodo National Park, Indonesia.

Diver looks on at sponges, coral and crinoids in a colorful Komodo seascape, taken at Cannibal Rock, Horseshoe Bay, Komodo National Park, Indonesia.

Diver looks on at sponges, pink soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

A trio of reef manta rays (Mobula alfredi) swimming above a reef top, Komodo National Park, Indonesia.

Diver looks on at sponges, soft corals and crinoids in a colorful Komodo seascape, Komodo National Park, Indonesia.

Close-up view of a green turtle (Chelonia mydas) resting on a reef top in Komodo National Park, Indonesia.

Yellow-Ridged Ceratosoma (Ceratosoma flavicostatum) nudibranch, head on view, Komodo National Park, Indonesia.

Large school of dozens of scalloped hammerhead shark converging towards the surface, silhouetted against the blue water, Cocos Island.

Blue and white striped Periclimenes shrimp over a mottled green and red anemone, Jardines De La Reina, Cuba.

Portrait of an American saltwater crocodile on the surface of a mangrove at sunset with mouth wide open, Jardines De La Reina, Cuba.

Enormous whale shark (Rhincodon typus) in clear blue water with sunrays, Christmas Island, Australia.

Head-on portrait of purple anthias (Pseudanthias tuka) in black water, Manado, North Sulawesi, Indonesia.

Pair of pink skunk clownfish (Amphiprion perideraion) nestled in a round bright orange anemone, Manado, North Sulawesi, Indonesia.

Bumphead parrotfish (Bolbometopon muricatum) swimming over the Liberty Wreck in Tulamben, Bali, Indonesia.

Whale shark swimming under a boat, with sharp sunrays cutting through the water, Cenderawasih Bay, West Papua, Indonesia.

Whale shark coming up from the depths under the boat, mouth wide open, with sharp sunrays cutting through the water.

American saltwater crocodile (Crocodylus acutus) in mangrove with mouth open showing teeth, Jardines De La Reina, Cuba.

A large whale shark under a bagan, siphoning water from the surface, with sunrays shining in the water, Cenderawasih Bay, West Papua, Indonesia.

Top view of a pnk barrel sponge looking like a saucer against the cyan reef bottom, Cenderawasih Bay, West Papua, Indonesia.

Pair of Caribbean reef sharks (Carcharhinus perezi) swimming along the reef, Jardines De La Reina, Cuba.

Pair of orange and red christmas tree worms on top of yellow hard coral, Pulau Aur, Johor, Malaysia.