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Urchin
Sea urchins or urchins, archaically called sea hedgehogs, are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum.

Gallery

Is a Crocodile a Reptile?

Books

Reef Life A Guide to Tropical Marine Life 

A diver's guide to underwater Malaysia Macrolife

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