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Mountain Bluebird (Sialia currucoides)

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Nest Cavities - Book Early

Swallows and bluebirds — like this Western Bluebird — are among the earliest northbound migrants to arrive, heralding spring a month before the equinox. Both species will nest only in cavities, such as old woodpecker holes or man-made nestboxes. But the supply of specialized nest sites is limited... read more »

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Topics & Themes:  nesting

Why Are Bluebirds Blue?

Why are bluebirds blue? Unlike many other bird colors, blue is not a pigment but 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. The even finer structure of the feather gathers... read more »

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Topics & Themes:  science
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