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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

 This purple urchin Paleopneustes cristatus is seldom seen by itself, and...
Dr. Valerie Paul, director of the Smithsonian Marine Station at Fort Pierce, Fla., examines tropical seaweeds on northwestern Guam’s coral reefs.
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Diving in Guam

 Dr. Valerie Paul is studying chemical defenses that may protect coral reefs from...
Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

 Dr. Stephen Cairns is a research zoologist and chair of the Department of...
An underwater photo of coral recovering from a bleaching event.
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Resilient Coral

 Is it lights out for corals once they have experienced a bleaching event? Not...