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40.0 MB (4.9 MB compressed)
4579 x 3051 pixels
38.9 x 25.9 cm ⏐ 15.3 x 10.2 in (300dpi)
GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Sea urchins (Astropyga radiata). Sea urchins are echinoderms, relatives of the starfish. They possess a rigid body covered in numerous movable venomous spines, which protect them from predators. They also have five-fold body symmetry. Urchins feed on algae and other organic material which they scrape from the surface of rocks. Photographed off Sulawesi, Indonesia.
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