Sea urchins are echinoids. They have a body enclosed by a hard exoskeleton. They are usually found in shallow water. They sit on solid surfaces, like rocks. Their body is armed with long, movable spines, ranging from about 6 to 12 centimeters. They help protect the urchin from predators. They move by using their tube feet. Urchins feed on algae and some marine plants.
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