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Coral Reefs (2)
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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

August 2012

Pink crustose algae covers the surface of a rock.

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Encrusting Pink Algae and a Seastar

July 2014

A male mudflat fiddler crab (Uca rapax) waves its huge claw to impress females and threaten competitors.

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The Mudflat Fiddler Crab

January 2010

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