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Although algae are the primary diet, sea urchins also eat slow-moving ( sessile) animals. Sea urchins move slowly, crawling with tube feet, and also propel themselves with their spines. ![]() ![]() The spherical, hard shells ( tests) of sea urchins are round and spiny, ranging in diameter from 3 to 10 cm (1 to 4 in). About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone - from the intertidal seashore down to 5,000 metres (16,000 ft 2,700 fathoms). Sea urchins ( / ˈ ɜːr tʃ ɪ n z/) are spiny, globular animals, echinoderms in the class Echinoidea. ![]() Tripneustes ventricosus and Echinometra viridis
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