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Favorite Images of Sea Urchins
Animals list created by kathy
A list of my favorite images of sea urchins.
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 5,000 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 and feed on mostly algae. Sea otters, sea stars, wolf eels, triggerfish and other predators hunt and feed off 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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