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A camouflaged horned flathead (Thysanophrys carbunculus) lays hidden on a sandy slope near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

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.

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.

Crinoids cling to a large sponge on a healthy coral reef near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

An unusual sea star (Linckia laevigata) clings to a diverse reef near the island of Bangka, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A well-camouflaged devil scorpionfish (Scorpaenopsis diabolus) waits to ambush prey on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A small, colorful goby sits on a coral colony amid the remote, tropical islands of Raja Ampat, Indonesia.

A school of lined sweetlips, Plectorhinchus lineatus, swim above a healthy coral reef 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.

Garden coral, sponges, and other invertebrates grow in a shallow seagrass meadow 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 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.

An unidentified scorpionfish waits to ambush prey on a black sand slope 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 nudibranch, Hypselodoris tryoni, crawls across a sandy sea floor 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 school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.

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

Sea urchins just caught and opened showing the edible cores (uni), Perna inlet, Palmizana, St Clement island, Hell's Islands (Pakleni), Hvar city, Hvar island, Croatia, Southeast Europe

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

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) 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

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

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

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

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

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

Diving and snorkling area, Punta Perdiz near Playa Giron, Bay of Pigs, Matanzas Province, Cuba, West Indies, Caribbean, Central America

Flying fish from the family Exocoetidae take flight as the ship flushes them just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

Underwater photo taken 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

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

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

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

Southern stingray (Hypanus americanus), with snorkeler 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

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

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

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

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

Bangka (boat) over coral, Chindonan Island, Calamian Islands, Coron, Palawan, Philippines, Southeast Asia, Asia

A tiny cleaner shrimp removes parasites from a Black-finned snake eel (Ophichthus cephalozona) on a sandy seafloor in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Rugged limestone islands surround a gorgeous lagoon in a remote part of 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.

Forest-covered limestone islands surround a gorgeous lagoon in a remote part of 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 beautiful starfish (Linckia laevigata) lays on a thriving reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A pycnogonid, or sea spider, crawls along the mucky seafloor of Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Detail of a large coral polyp in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

A shortfin lionfish (Dendrochirus brachypterus) lays on the seafloor waiting for prey to swim near in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Soft corals, sponges, and other invertebrates compete for space on a beautiful reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A colorful nudibranch (Nembrotha kubaryana) crawls slowly across a reef near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

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

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.

Detail of a coral colony in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Acoel flatworms cover a coral colony on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Detail of a mushroom coral (Fungia sp.) on a 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

A crown-of-thorns sea star (Acanthaster planci) feeds on a living coral colony among the remote, tropical islands of Raja Ampat, Indonesia.

A discarded plastic bag drifts underwater amid the remote, tropical islands of Raja Ampat, Indonesia. Plastics break into tiny pieces that eventually enter the food web.

A vibrant nudibranch, Chromodoris sp., crawls across a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

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

Spotted eagle rays (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, 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

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

Looking down into the Los Peces fresh water cave near Playa Giron, Matanzas Province, Cuba, West Indies, Caribbean, Central America

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

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

Coral Reefs Monument at the waterfront of San Miguel de Cozumel, Cozumel Island, Quintana Roo State, Mexico

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

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

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

The sergeant major or pintano fish(Abudefduf saxatilis) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

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

Nurse shark (Ginglymostoma cirratum) seen during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico

Underwater photo taken during the Palancar Gardens, El Cielito and Colombia Deep Reef Snorkelling Tour, Cozumel Island, Quintana Roo State, Mexico