MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Allied cowrie on a sea fan. Allied cowries (Ovula ovum) are sea snails that cover their shell with a mantle, which is coloured and textured to match the host organism. In this way it looks similar to a sea slug (nudibranch). This may help it avoid predation, as nudibranchs are usually highly toxic. Photographed off Ambon, Indonesia.
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