GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
False fire urchin (Astropyga radiata, red) and a long-spine urchin (Diadema setosum, black). Sea urchins feed mainly on algae, but will also eat invertebrates such as mussels, sponges and brittle stars. Photographed in Lembeh Strait, North Sulawesi, Indonesia.
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