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A school of striped eel catfish (Plotosus lineatus) swarms over a reef searching for food in the Lesser Sunda Islands of Indonesia.

A blue line grouper (Cephalopholis formosa) swims on a reef in the Lesser Sunda Islands of Indonesia.

A coconut octopus (Amphioctopus marginatus) clings to shells on the seafloor in Lembeh Strait, Indonesia.

A young painted frogfish (Antennarius pictus) sits on the volcanic seafloor of Lembeh Strait, Indonesia.

A coconut octopus (Amphioctopus marginatus) clings to shells on the seafloor in Lembeh Strait, Indonesia.

A juvenile many-spotted sweetlips (Plectorhinchus chaetodonoides) feeds on a small fish near the seafloor in Lembeh Strait, Indonesia.

A pair of harlequin shrimp (Hymenocera elegans) lie in a small recess on the seafloor of Lembeh Strait, Indonesia.

A crown of thorns starfish (Acanthaster planci) feeds on a coral reef growing near an island in the Banda Sea, Indonesia.

A well-camouflaged tasseled wobbegong shark (Eucrossorhinus dasypogon) lies on the sandy seafloor of Raja Ampat, Indonesia.

A spinner dolphin, Stenella longirostris, gracefully glides through the clear, blue waters of the Pantar Strait near Alor in Indonesia.

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

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Colorful chocolate chip sea stars, Protoreaster nodosus, cover the seafloor in a seagrass meadow in Wakatobi National Park, Indonesia.

Soft coral colonies, Sinularia sp., thrive on a reef found among the remote, tropical islands of Raja Ampat, Indonesia.

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

A pair of Chromodoris annae nudibranch crawl on a large tunicate among the remote, tropical islands of Raja Ampat, Indonesia.

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

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

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

Mother and calf humpback whales, Megaptera novaeangliae, swim in the clear, blue waters of the Caribbean Sea.

A young humpback whale, Megaptera novaeangliae, breaches out of the blue waters of the Caribbean Sea.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

A humpback whale, Megaptera novaeangliae, raises its powerful fluke out of the blue waters of the Caribbean Sea and slams it down on the surface to communicate.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

A magnificent humpback whale, Megaptera novaeangliae, swims in the clear, blue waters of the Caribbean Sea.

A banded sea krait, Laticauda colubrina, searches for prey on a coral reef in Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

Bright beams of sunlight descend into the shadows of a blue water mangrove forest in Raja Ampat, Indonesia.

Beams of light descend through a wooden jetty in the Dampier Strait, Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

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

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 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.

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 beautiful nudibranch, Bornella anguilla, crawls over black sand in Komodo National Park, Indonesia. This rare nudibranch can swim over short distances quite well.

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 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 Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.

A Wonderpus, Wunderpus photogenicus, hunts for prey on the sandy seafloor in Lembeh Strait, Indonesia.

A well-camouflaged ornate ghost pipefish, Solenostomus paradoxus, hovers over a reef in Komodo National Park, Indonesia.

A well-camouflaged ornate ghost pipefish, Solenostomus paradoxus, hovers over a reef in Komodo National Park, Indonesia.

A hairy frogfish, Antennarius striatus, lies on the dark, sandy seafloor in Lembeh Strait, Indonesia.

A school of blue-green damselfish, Chromis viridis, hovers amid the tropical islands of Raja Ampat, Indonesia.

A huge giant clam, Tridacna gigas, grows on a shallow coral reef amid the tropical islands of Raja Ampat, Indonesia.

A colorful flamboyant cuttlefish, Metasepia pfefferi, crawls across the sandy seafloor in Lembeh Strait, Indonesia.

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

California sea lions (Zalophus californianus), grouped together on a channel marker off Newport Beach, California, United States of America, North America

A well-camouflaged tasselled wobbegong, Eucrossorhinus dasypogon, lies on the seafloor in Raja Ampat, Indonesia.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A colorful ornate ghost pipefish, Solenostomus paradoxus, hovers over a coral reef in Komodo National Park, Indonesia.

A well-camouflaged flasher scorpionfish, Scorpaenopsis macrochir, lies on a black sand slope just outside of Komodo National Park, Indonesia.

A small, well-camouflaged cuttlefish, Sepia sp., hovers on a rocky seafloor in the Banda Sea, Indonesia.

A cute red-spotted blenny, Blenniella chrysospilos, looks out from its protective home on a coral reef in Indonesia. This combtooth blenny feeds on algae.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

Detail of a reef-building coral colony, Favia sp., growing on a healthy reef in Komodo National Park, Indonesia.