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Coral reefs provide food for swarms of fish, both large and small.
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Coral Reef in the Florida Keys

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Coral Reef on Gangga Island, Indonesia

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
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Bleached Corals

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Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

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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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A scuba diver explores elkhorn corals growing on a tropical reef.
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Exploring a Reef

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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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A stingray swims in an Australian marine reserve.
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Australia's 1.2 Million Mile Marine Reserve

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Colorful Christmas tree worms
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A Forest of Christmas Tree Worms

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