Sea urchins are a class of marine animals that live on the seabed or burrow into the sand. Those that live on rocky seabeds are spherical and have prominent, protective spines. Those that live on, or burrowed into, soft sand are heart-shaped or flattened, like the sand dollar, and have short spines that make them look furry.
Scientific name: Echinoidea
The Sea urchins can be found in a number of locations including: Great Barrier Reef. Find out more about these places and what else lives there.
Sea urchins or urchins, sometimes called sea hedgehogs, are small, spiny, globular animals which, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. About 950 species of echinoids inhabit all oceans from the intertidal to 5000 m deep. The shell, or "test", of sea urchins is round and spiny, typically from 3 to 10 cm (1.2 to 3.9 in) across. Common colors include black and dull shades of green, olive, brown, purple, blue, and red. Sea urchins move slowly, feeding mostly on algae. Sea otters, sea stars, wolf eels, triggerfish, and other predators feed on sea urchins. Their roe is a delicacy in many cuisines. The name "urchin" is an old name for the round spiny hedgehogs which sea urchins resemble.
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