The Urchins are around 950 species of marine echinoderms. He is characterised by his symmetry and spines, which protect him from predation. They are dioecious, with individuals being either male or female. Males tend to live in more elevated and exposed positions, whereas females favour low-lying locations. Urchins feed on algae, which is consumed through an orifice in his lower half - this acts as both mouth and anus. It is studded with calcium carbonate "jaws" and features a fleshy tongue-like structure. Whilst Urchins have no apparent eyes, his entire body is a sensory organ and sensitive to touch, light and chemicals. Locomotion is slow, but achieved by adhesive tube feet.
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