The Western Bluebird is a common and widespread thrush in Arizona, especially in open woodlands, grasslands with scattered trees, agricultural areas, and forest edges. Males are strikingly colored, with deep blue plumage on the head, wings, and tail, and a rich chestnut-red breast and sides. Females are more subdued, gray-brown overall with touches of blue on the wings and tail. This species often nests in tree cavities, fence posts, and nest boxes, making use of both natural hollows and artificial structures.
In Arizona, Western Bluebirds are resident in many upland regions year-round, particularly in ponderosa pine forests of the Mogollon Rim and the Sky Islands, though some populations shift to lower elevations during winter. Their diet is varied, consisting of insects and other invertebrates in warmer months, shifting to berries and fruits in the colder season. Western Bluebirds are highly social outside of the breeding season, often forming flocks and sometimes joining mixed-species groups.
