Wednesday, April 7, 2010

Bald eagles have 7,000 feathers. Feathers, like hair and nails, are made of keratin. The feathers consist of interlocking microscopic structures that are light, but very strong. Layers of feathers trap air to insulate birds against cold and protect them from rain. Here we have the male eagle showing us his feathers as he approaches the nest.

Brian Boyd

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