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How do birds feathers work in helping them to fly?

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Feathers are important parts of the bird's 'flying equipment'. A bird's tail feathers are used for lifting, steering, and breaking and these are perfectly symmetrical to allow a balanced and smooth flight.

Along the sides of a bird's feathers are barbs, which if separated look like a fringe, or even like the threads that stick out from the edge of a piece of unstitched cloth. Since these barbs end in hooks, they hook on to one another efficiently, making a strong but light flying wing.
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