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The vane of the feather is formed of many individual feather barbs. Adjacent barbs are hooked together with a series of microscopic hooks, like velcro. The hooks can be unzipped by pulling gently on the barbs and zipped up again by running the barbs through your fingers. Birds zip their feathers back up by preening -- running the bill over their feathers.
https://whozoo.org/ZooPax/ZPFeather.htm
https://whozoo.org/ZooPax/ZPFeather.htm
Everything You Need To Know About Feathers
https://academy.allaboutbirds.org/feathers-article/
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