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confused asked

How are birds’ feathers waterproofed?

biologyanimalsbirds
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einstein answered
Birds pick up oil on their beaks, by rubbing against the uropygial or preen gland near the tail, and then rub it over their feathers. This coating insulates the interlocking barbules in the feather. As water cannot penetrate through the oil coating, the feather is waterproof.
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