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It can clamp itself down on the rock face with pedal mucus and its muscular ''foot''. When the tide is high, the foot is contracted, allowing it to move around and graze the rock for algae.

Their ability of being able to clamp themselves to the rock, seals their shell edge against the rock surface, protecting them from desiccation.

When limpets are fully clamped down, it is impossible to remove them from the rock using brute force alone, and the limpet will allow itself to be destroyed rather than stop clinging to its rock.

Most limpets feed by grazing on algae which grows on the rock where they live. They scrape up films of algae with a radula, a ribbon-like tongue with rows of teeth. Limpets move by rippling the muscles of their foot in a wave-like motion.

Some species of limpets return to the same spot on the rock known as a "home scar" just before the tide goes out. The shape of their shell often grows to precisely match the contours of the rock surrounding the scar. This behaviour presumably allows them to form a better seal to the rock and may help protect from either desiccation or threat from predators.

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14y ago

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