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Acropora species scleractinic hard corals, showing some bleaching, growing on a coral reef in Gaafu Dhaalu atoll, Maldives

A shoal of small fish swimming over Acropora species hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

A hawksbill sea turtle (Eretmochelys imbricata) feeds on sponge and an angelfish follows for scraps in Cozumel, Mexico.

A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.

A toadfish patiently waits inside a pipe cavity ready to prey on any fish passing by. A Toadfish is an ambush predator at 95 feet deep in Gulf waters at the Dupont Span One artificial reef about 12 miles off the coast of Panama City Beach, Florida.

A Spotfin Butterflyfish (Chaetodon ocellatus) feeding off the coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

A French Angelfish (Pomacanthus paru) swims up close to a Blue Striped Grunt (Haemulon sciurus) under a coral reef ledge in the Atlantic Ocean off the coast of Key Largo, Florida.

A Rainbow Parrotfish (Scarus guacamaia) pokes it's head out from a hole in the coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

A Gray Angelfish (Pomacanthus arcuatus) swims by diamond and fire corals in the shallow waters of the Atlantic Ocean off the coast of Key Largo, Florida.

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

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

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

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

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

Bigeye Trevally (Caranx sexfasciatus), schooling in Cabo Pulmo National Marine Park, Baja California Sur, Mexico, North America

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

Half above and half below on a remote small Islet in the Badas Island Group off Borneo, Indonesia, Southeast Asia, Asia

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, 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

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

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

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 shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse sharks (Ginglymostoma cirratum), massing 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) over sand in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Spotted eagle ray (Aetobatus narinari), Hol Chan Marine Preserve, 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 snorkelers 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 land hermit crab (Coenobita clypeatus), Half Moon Caye, UNESCO, Mesoamerican Barrier Reef, Belize

Caribbean land hermit crab (Coenobita clypeatus), Half Moon Caye, UNESCO, 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

White morph of the Pacific reef heron (Egretta sacra), Mitchell River National Park, Kimberley, Western Australia, Australia, Pacific

A profusion of hard and soft corals on Sebayur Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Elbow Reef Lighthouse, the last kerosene burning manned lighthouse in the world, Hope Town, Elbow Cay, Abaco Islands, Bahamas, West Indies, Central America

A huge iceberg grounded on a reef near the Iceberg Graveyard, Petermann Island, Antarctica, Polar Regions