IGCSE Biology 4th edition

Biology books by
D G Mackean

Birds. Feather Structure

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Birds. Feather Structure
Bird feathers consist of a shaft with rows of fine filaments (barbs) on each side. The barbs themselves have finer filaments (barbules) branching from them. In the down feathers, the barbs and barbules are loose and fluffy. They trap an insulating layer of air close to the body and so reduce heat losses.

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