Western Bluebird

Sialia mexicana




Thrushes (Turdidae)

Code 4


Code 6



Egg Color:

Pale blue

Number of Eggs:

3 - 8

Incubation Days:

13 - 14

Egg Incubator:


Nest Location:

2 - 50 feet above ground.

Nest Material:

Grass, weeds, stems, pine needles, and twigs.


Northern birds migrate



Western Bluebird: Small thrush with deep blue hood and upperparts, crescent mark across upper back, red-brown breast, and white belly. Female is gray above with dull blue wings and tail. Breast and flanks are chestnut, throat is pale gray. Juvenile resembles female but is grayer and has speckled underparts.

Range and Habitat

Western Bluebird: Breeds from British Columbia and western Alberta south to Baja, east throughout the mountains of the west to eastern New Mexico. Spends winters throughout most of its breeding range, although northernmost populations withdraw southward. Preferred habitats include open woodlands and pastures where old trees provide nest sites.

Breeding and Nesting

Western Bluebird: Three to eight pale blue eggs are laid in a grass nest built in a tree cavity or woodpecker hole. Incubation ranges from 13 to 14 days and is carried out by the female.

Foraging and Feeding

Western Bluebird: Diet consists of insects, earthworms, spiders, and snails. Takes berries during winter. Often hunts from low perches, from which it drops down to the ground to capture prey; also catches flying insects.

Readily Eats

Raisins, Currants, Nut Meal


Western Bluebird: Call is a soft "kew," repeated several times.

Similar Species

Western Bluebird: Eastern Bluebird has red-brown throat and breast, white belly and undertail coverts, and blue back.


Belly, undertail coverts, chest, flanks, and foreneck.

Back, rump, hindneck, wings, and crown.
The ventral part of the bird, or the area between the flanks on each side and the crissum and breast. Flight muscles are located between the belly and the breast.
The upper front part of a bird.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X