western bluebird

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western bluebird

western bluebird

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western bluebird

bird

Also known as: Sialia mexicana

Learn about this topic in these articles:

conservation and biodiversity

In conservation: Calculating background extinction rates
…pairs of sister taxa including western and eastern bluebirds (Sialia mexicana and S. sialis), red-shafted and yellow-shafted flickers (both considered subspecies of Colaptes auratus), and ruby-throated and black-chinned hummingbirds (Archilochus colubris and A. alexandri). According to the rapid-speciation
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description

In bluebird
…1/2 inches) long, and the western bluebird (S. mexicana) are red-breasted forms found east and west of the Rockies, respectively; the mountain bluebird (S. currucoides), also of the west, is all blue. Bluebirds arrive from the south in earliest spring, uttering soft, blurry notes. They live in open country and…
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