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| Meet the purple sea urchin at Monterey Bay Aquarium. |
Sea Urchin or Echinus, a genus of sea animals, belonging to the same group as the starfish, sea lily and sea cucumber. The body of the sea urchin is more or less globular and covered with a shell which is often studded with movable spines. Sea urchins, of which there are many species, are found in shallow water in almost all parts of the world, those of the tropical regions being largest.
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