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Juvenile alligator in swampland (bayou) at Jean Lafitte National Historical Park and Preserve, south of New Orleans, Louisiana, USA

Tropical coral reef scene with a large table coral (Acropora pharaonis), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

A Coconut Octopus (Amphioctopus marginatus), a species that gathers coconut and mollusk shells for shelter, Lembeh Strait, Sulawesi, Indonesia, Southeast Asia, Asia

A Coconut Octopus (Amphioctopus marginatus), a species that gathers coconut and mollusk shells for shelter, Lembeh Strait, Sulawesi, Indonesia, Southeast Asia, Asia

A harlequin swimming crab (Lissocarcinus laevis), lives with this sea anemone in symbiosis, Philippines, Southeast Asia, Asia

Clown anemonefish (Amphiprion percula), in anemone (Heteractis magnifica), Philippines, Southeast Asia, Asia

Florida manatees (Trichechus manatus latirostris), gather at Three Sisters Springs in Crystal River, Florida, United States of America, North America

A Coconut Octopus (Amphioctopus marginatus), a species that gathers coconut and mollusk shells for shelter, Lembeh Strait, Sulawesi, Indonesia, Southeast Asia, Asia

Close-up view of a Hawksbill sea turtle next to a red sea fan on a reef in Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Hairy squat lobster (Lauriea siagiani) amongst a pink and orange colored sponge, Tulamben, Bali, Indonesia, Southeast Asia, Asia

Colorful soft corals (Dendronephthya sp.) adorn the stunning reefs of southern Raja Ampat, West Papua, Indonesia, Southeast Asia, Asia

Giant hermit crab (Petrochirus diogenes), off Singer Island, Florida, United States of America, North America

Blackmouth sea cucumber (Pearsonothuria graeffei) on coral reef, Ras Mohammed National Park, Sharm Eel-Sheikh, Red Sea, Egypt, North Africa, Africa

Tropical coral reef scene, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Giant sea fan coral (Gorgonian fan coral) (Annella mollis), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above Table coral, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Coral reef scene, shoal of glassfish (Arapriacanthus ransonneti), Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above coral reef scene, Ras Mohammed National Park, Sharm el-Sheikh, Red Sea, Egypt, North Africa, Africa

Tropical coral reef scene, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Silhouette of two scuba divers above coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Silhouette of three scuba divers above giant sea fan (Annella mollis), Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

Silhouette of three scuba divers above coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

A slightly bleached staghorn coral colony grows in shallow water in the Solomon Islands. This Melanesian region is known for its spectacular marine biodiversity.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

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 beautiful coral reef grows near a set of limestone islands in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

A diverse array of corals grow in Raja Ampat, Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

Vibrant soft coral colonies grow on a reef dropoff in Lembeh Strait, Indonesia. This area is known for its spectacular marine biodiversity.

Coral polyps (Galaxea sp.) wait for plankton on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A Clark's anemonefish (Amphiprion clarkii) snuggles into the tentacles of its host anemone in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

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.

Abstract of a mushroom coral (Fungia sp.) growing on a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A Black-finned snake eel (Ophichthus cephalozona) pokes its head out of a sandy seafloor in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Detail of a stony coral (Galaxea sp.) growing in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

Lily pads grow along the shallow edge of a freshwater lake in New England. Aquatic vegetation, which thrives during summer months, provides vital habitat for many fish, amphibians, and reptiles.

Colony of tunicates grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

Colorful tunicates and soft corals grow on a reef in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

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 small red starfish clings to coralline algae in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A shallow coral reef thrives in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A female ribbon eel (Rhinomuraena quaesita) yawns as it lives on a sandy slope near Alor in the Lesser Sunda Islands of Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

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

A hermit crab crawls across a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

A tiny shrimp (Periclimenes soror) lives on a pin-cushion starfish in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Bright sunlight shines down on lily pads growing along the shallow edge of a freshwater lake in New England. Aquatic vegetation, which thrives during summer months, provides vital habitat for many fish, amphibians, and reptiles.

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 predatory stonefish (Synanceia verrucosa) lies camouflaged in the sandy seafloor of Komodo National Park, Indonesia. This is the most venomous fish on Earth but uses its venom only for defensive purposes.

A predatory stonefish (Synanceia verrucosa) lies camouflaged in the sandy seafloor of Komodo National Park, Indonesia. This is the most venomous fish on Earth but uses its venom only for defensive purposes.

A pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.

A cluster of colorful tunicates grow on a coral reef amid the remote, tropical islands of Raja Ampat, Indonesia.

A blue starfish on a beautiful coral reef in the shallows of 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.

Healthy corals thrive along the edge of a mangrove forest in a remote part of Raja Ampat, Indonesia.

Colorful chocolate chip starfish lie scattered on the floor of a 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.

Symbiotic anemones cover the shell of a hermit crab, Dardanus pedunculatus, 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.

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 magnificent sea anemone, Heteractis magnifica, grows on a 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 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.