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Q: Why are Bluebirds blue? (Photo: A Bluebird feeds its young. By Steve Corey, Flickr)

A: Unlike many other bird colors, blue is not a pigment. It’s a color produced by the structure of the feathers. Tiny air pockets and melanin pigment crystals in each feather scatter blue light and absorb the other wavelengths. That beautiful blue light leaves the feather to dazzle the eye of the beholder. More.

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    This is the best answer I’ve seen for this. The whole blue feather question is confusing.
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