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Project Noah Nature School
Tropical Reefs
found this on the beach, already dead of course. I find it quite interesting.
A sea urchin sans spineshttp://en.wikipedia.org/wiki/Sea_urchin
Spotted on Jun 27, 2008 Submitted on Apr 18, 2011
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A sea urchin sans spines
http://en.wikipedia.org/wiki/Sea_urchin