PETER CHADWICK / SCIENCE PHOTO LIBRARY PETER CHADWICK / SCIENCE PHOTO LIBRARY
Child holding a sea urchin (Parechinus angulosus). The sea urchin is an echinoderm, a type of marine invertebrate. It has five-fold radial symmetry, though its five arms have fused to form a spherical shell from which these spines protrude. Sea urchins feed on algae growing on rocks in coastal tidal areas. Photographed at the De Hoop Nature Reserve, South Africa.
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