Sea Urchin, Santa Ponsa, Mallorca from Travel with Iva Jasperson

Sea Urchin, Santa Ponsa, Mallorca from Travel with Iva Jasperson

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Sea urchins or urchins, archaically called sea hedgehogs, are small, spiny, globular animals that, 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 meters (16,000 ft; 2,700 fathoms) 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 primarily on algae. Sea otters, starfish, wolf eels, triggerfish, and other predators hunt and feed on sea urchins. The name "urchin" is an old word for hedgehog, which sea urchins resemble.

info from Wikipedia
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