Basket full of Sea Urchins

Sea urchins or urchins (/ˈɜːrtʃɪnz/) are typically spiny, globular animalsechinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms).[1] Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 to 4 in) across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea ottersstarfishwolf eels, and triggerfish.

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