Western Bluebird

The Western Bluebird is a small thrush of open woodlands and grasslands across the western United States, closely related to the Eastern Bluebird but distinguishable by its plumage pattern. Males have deep blue on the head, wings, and tail, a chestnut-orange breast and flanks, and often a chestnut patch across the upper back, with the throat remaining blue rather than orange. Females are duller, with grayish-brown upperparts washed with blue on the wings and tail, and a muted orange breast.

This species is often found in loose flocks, especially in winter, and readily uses nest boxes, benefiting from conservation programs similar to those that helped Eastern Bluebird populations recover.

Key Field Marks

• Male: blue head, wings, and tail; blue throat (not orange); chestnut breast, flanks, and often a chestnut back patch
• Female: duller grayish-brown with blue-washed wings and tail, pale orange breast
• Compact, thrush-like body with an upright perching posture
• Often perches on fence lines, wires, or low tree branches

Similar Species

• Eastern Bluebird: male has an orange (not blue) throat and lacks the chestnut back patch; ranges are largely separate with little overlap.
• Mountain Bluebird: male is entirely sky blue without any chestnut or orange tones; found in more open, treeless habitat, often at higher elevations or more northern latitudes.
• Lazuli Bunting (male): also blue with an orange breast, but much smaller, with white wing bars and a stubby conical seed-eating bill.

Habitat

Western Bluebirds favor open woodlands, especially oak and pine woodlands, as well as orchards, burned or logged forest openings, and grasslands with scattered trees for nesting and perching.

Range

They are resident or short-distance migrants across the western United States, from the Pacific coast to the Rocky Mountains, and south into parts of Mexico.

Migration

Some populations, especially at higher elevations, migrate to lower elevations or move south in winter, while others remain resident year-round; wintering birds often gather in loose flocks and forage together.

Behavior

Western Bluebirds often forage from a perch, watching the ground and dropping down to catch insects, and outside the breeding season they commonly form small flocks, sometimes mixing with Mountain Bluebirds where ranges overlap.

Voice

The song is a soft, low, warbled series of notes, quieter and less musical than the Eastern Bluebird's song; calls include a short, low "few" or "mew" note.

Feeding

Insects such as beetles, grasshoppers, and caterpillars make up much of the diet during the breeding season, while berries and fruit, including mistletoe berries, become important in fall and winter.

Nesting & Breeding

Western Bluebirds nest in cavities, including old woodpecker holes and nest boxes, and are sometimes cooperative breeders, with helper birds (often offspring from a previous brood) assisting in raising young. They typically lay 4-6 pale blue eggs.