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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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This map shows where some of the most significant species of deep-sea corals are located.
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Deep-Sea Corals Worldwide

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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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A photo of coral visibly affected by disease.
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Diseased Coral

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Photo of coral polyp, with a single bleach polyp.
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Corals Threatened by Acid Seas

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Pygmy Seahorse Blends Into its Environment
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Eye to Eye With a Pygmy Seahorse

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A red snapper hunts for prey on Kingman’s Reef, a healthy reef in the Line Islands.
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Kingman’s Reef, Line Islands

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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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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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Overfishing and sedimentation have heavily impacted this reef off the coast of Guam.
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Coral Reef in Distress

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Compare the healthy coral on the left with the bleached coral on the right.
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Bleached Corals, Pacific Ocean

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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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