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Valentinni's sharpnose puffer lives on Indo-Pacific coral reefs, where it shoals in groups of 10-100 puffers and feeds on algae and tunicates.
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Valentinni's Sharpnose Puffer

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A purple hard coral releases bundles of pink eggs glued together with sperm.
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Coral Spawning

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Scientist Martha Nizinski examines a sample of the deep-sea coral Lophelia pertusa, collected 600-m (1,969-ft) deep off the coast of the southeastern United States.
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Deep-Sea Coral Sample

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Coral scientist Dr. Amy Baco-Taylor observed corals like these on her first submarine dive to a deep-sea coral bed off the coast of Hawaii.
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Deep-Sea Coral Community

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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: Black corals often resemble bushes or trees. Their living tissue can be one of several colors. It’s the skeleton that is black.
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Black Corals

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This black coral is more than 4,200 years old. Named for the color of their skeletons, black corals come in many colors.
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How old is black coral?

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Scientists recently discovered the Christmas tree coral (Antipathes dendrochristos) off the southern California coast.
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New Christmas Tree Coral

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Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

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Whitemouth morays hide in the crevices of Indo-Pacific coral reefs with only their heads (and white mouths) emerging, mouths agape, to breathe and hunt crustaceans and fish.
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Eel, Embedded

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In some reefs, small fishes such as this broad-barred goby protect corals by eating invading seaweeds.
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Coral Goby Cleans Coral

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It's a pygmy seahorse (Hippocampus bargibanti), found in Indonesia's biodiverse Coral Triangle and one of the smallest seahorse species in the world! They can change colors like a chameleon to blend into their environment. This helps to protect them from p
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Can You Spot the Seahorse?

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