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The pink strands of this coral harbor a variety of organisms. Sea whips are gorgonian corals, with flexible skeletons.
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Sea Whip Coral

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: A thicket of Lophelia pertusa, a widespread deep sea coral, shelters a squat lobster.
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Coral Thicket with Lobster

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Unlike the shallow tropical coral reef at left, the deep-sea Oculina reef at right does not require sunlight.
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Shallow and Deep-Sea Coral Reefs

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
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Unhealthy Coral Reef, Kiritimi, Line Islands

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A coral reef covered by silt and sand in the Western Pacific Ocean.
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Coral Reef Covered by Silt and Sand

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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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On Moorea, an island in French Polynesia, researchers are striving to complete a biocode—a DNA catalog of every life form big enough to pick up with tweezers.
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The Island of Moorea

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Coral Head Near Pearl and Hermes Atoll, Hawaii
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Coral Head Near Pearl and Hermes Atoll

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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 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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Red coral necklaces in a display window. Harvesting deep-sea coral to produce jewelry like this threatens these ecosystems.
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Coral for Sale

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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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