Barnacles cling to rocks in the tidal zone, between high and low tide. Find a tide pool whose barnacles are still under water. If you sit very still and watch carefully, you will be rewarded by the sight of their feather-like "tongue" as it waves gracefully out of the opening and closing crack in the centre. This feather-like structure gathers plancton to eat, but if you move and your shadow crosses over the barnable, it closes up tight to protect itself.
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