Labels:bulletin board | daily | tribute album OCR: ECHINODERMS Sea Urchins the day they wedge themselves into tight cracks of the reef and are difficult tr retrieve The short- -spined urchins of the Caribbean typi- cally bury themselves in the shallow sand flats where they live becoming nearly invisible during the day Most urchins leave their protected areas and move about to hunt for food night Like all echinoderms urchins have radial or five- part symmetry as well as 3OF4
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