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A variety of organisms make their home on this tropical coral reef in Indonesia.
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Indonesian Coral Reef

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A Pontoh pygmy seahorse
Slideshow

10 Things You Never Knew About Seahorses

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
Slideshow

Bizarre and Beautiful Coral Reef Animals

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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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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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Flower-like clusters of pink polyps make up this coral colony.
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Coral Colony

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Sea bass flock to a tropical coral reef in the Red Sea.
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Coral Reef Ecosystem, Red Sea

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Two nurse sharks hover over a baited cage
Lesson Plan

Treasures in Jeopardy

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
Slideshow

Will Coral Reefs Survive Acidification?

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Pink crustose algae covers the surface of a rock.
Photo

Encrusting Pink Algae and a Seastar

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Two nurse sharks hover over a baited cage
Lesson Plan

Coral Adaptations

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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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