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A Coral Reef Watch satellite monitors the temperature of the world’s oceans.
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Coral Reef Watch Satellite

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Flower-like clusters of pink polyps make up this coral colony.
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Coral Colony

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Corallimorpharian
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Soft Coral Close-Up

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A pearly razorfish
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Pearly Razorfish

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Raccoon butterfly fish and angelfish on a reef in the Red Sea, near Sharm el Sheik, Egypt.
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Coral Reef Scene

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A coral catshark
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Coral Catshark

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A close-up photo of dead man's fingers (Alcyonium digitatum), living in the Baltic Sea.
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Dead Man’s Fingers

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An underwater photo of a yellow-mouth moray eel.
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Yellow-mouth Moray Eel in the Red Sea (Eilat, Israel)

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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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Cancer cells treated with discodermolide, a chemical from a sponge found on deep-sea coral reefs.
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Treated Cancer Cells

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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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A school of Hawaiian squirrelfish.
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A School of Hawaiian Squirrelfish

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