DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Sea urchin (Psammechinus miliaris). Sea urchins are echinoderms, relatives of the starfish. Their exoskeleton shell, or test, is covered in numerous spines that protect them from predators. These sea urchins, also known as common sea urchins, are found along the coast of the British Isles, excluding the east coast. They grow to diameters of 16 centimetres and feed on algae, mainly kelp, which they scrape from the surface of rocks. Photographed in a rock pool in Abbotsham in Devon, England.
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