Beach Walk
Periwinkles
![[Periwinkle drawing]](PERIWIN.GIF)
Periwinkles live in the spray zone, out of the water most of the time, covered only during the highest of tides. Few marine plants & animals can survive in this zone. Periwinkles use their long radula (toothed tonguelike structure) to scrape algae off rocks for food. When the water recedes, periwinkles seal themselves to rocks with a mucus produced by their foot. Periwinkles are thought to be ancestors of land snails.
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