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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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Coral Spawning by Moonlight

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Two coral trout swim on a reef in Fiji.
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Coral Trout in a Fiji Reef

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Smithsonian zoologist Dr. Steve Cairns named and described this deep-sea coral species, Stephanocyathus paliferus, now preserved at the National Museum of Natural History.
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Corals at the Smithsonian

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Bright bubblegum coral sits on a brown, hard substrate.
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Optimism in the Deep Sea - Connecting Corals, Museums, and Ocean Managers

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Coral showing signs of disease
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Disease Takes Hold

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coral polyps
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Healthy Coral Polyps

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An underwater photo of coral recovering from a bleaching event.
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Resilient Coral

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
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Reef Fish, French Frigate Shoals

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Two nurse sharks hover over a baited cage
Lesson Plan

What is a Coral Reef? Elementary School

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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 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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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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