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Sea urchin is the sea creature belonging to the Echinodermeta family. These are seen all the big seas. These are round and small in size. There will be armors on their body in form of thorns. There are more than 200 varieties in this species. These are generally black, green, olive brown, purple and red in colors. The mouth of sea urchin is made up of five carbonate jaws. A mechanism called Aristotle’s lantern in their mouth the food becomes small pieces. Recently it is found that sea urchins teeth are self sharpening. It can chew through stone. Sea Urchins are 3-4 inches in length. They move slowly and feed on algae.