Bluebird

BLUEBIRD (Sialia sialis), an American bird, blue in plum age, with a red breast. A harbinger of spring, this is one of the most familiar and best-loved birds in the United States. The nest is built in holes in trees and similar situations, but the bluebird is all too often driven out of these situations by the imported house sparrow (Passer domesticus).

Other species are the mountain bluebird

(S. arctica), of the Rocky mountains and more western states, an exquisite azure; the western bluebird (S. mexicana occidentalis); and the chestnut backed bluebird' (S. m. bairdi).