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A screenshot from the video of colorful corals.
Video

Slow Life: Time-Lapse on the Coral Reef

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Two nurse sharks hover over a baited cage
Lesson Plan

A Reef of Your Own

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stony corals among sea fans
Article

Ancient Reefs Reveal Glimpse at Future Oceans

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An underwater photo of coral recovering from a bleaching event.
Photo

Resilient Coral

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Two nurse sharks hover over a baited cage
Lesson Plan

Corrosion to Corals

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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.
Photo

What Is Coral? A Coral Polyp and Zooxanthellae

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Half a century after nuclear testing blasted the reefs of Bikini Atoll, corals have recovered.
Photo

Bikini Atoll Coral

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

Coral Reef Scene

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A coral catshark
Photo

Coral Catshark

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On a healthy coral reef, fish (as well as many other organisms) thrive. Not only are reefs beautiful, but they are also critical to ocean health and human livelihoods.
Photo

Healthy Coral Head

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Two coral trout swim on a reef in Fiji.
Photo

Coral Trout in a Fiji Reef

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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