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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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Shallow water coral reefs straddle the equator worldwide.
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Global Distribution of Shallow Coral Reef Ecosystems

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A diver on the reef near Moorea collects samples.
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Research Diver in Moorea

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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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Researchers adopted the “yabbie pump,” the long silver tool shown here, from Australian fishing gear.
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Collecting Shallow-Water Specimens with the "Yabbie Pump"

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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This piece of pocillopora, or cauliflower coral, would normally have a rigid outer skeleton, but researchers dissolved it to expose the coral’s tissue and take a sample for DNA analysis.
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Cauliflower Coral - Pocillopora

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A brittle star clings to the branches of a deep sea coral
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A Brittle Star May Be a Coral’s Best Friend

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A brittle star clings to the branches of a deep sea coral
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Brittle Star Coral Mutualism

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Two nurse sharks hover over a baited cage
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A Tale of Deep Corals

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Two nurse sharks hover over a baited cage
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Corrosion to Corals

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