Range. - Rocky Mountatin region, breeding from New Mexico north to Great Slave Lake; winters in southwestern United States and Mexico.

This azure blue species is common in the greater part of its range and is found west to the Sierra Nevadas in California. Like the eastern Bluebird they nest in holes in trees or anywhere that they can find a suitable cavity or crevice. Their eggs are slightly larger than those of the other Bluebirds and have a slight greenish tint; size .85 x .64.

768 Mountain Bluebird Sialia Currucoides 1541768 Mountain Bluebird Sialia Currucoides 1542768 Mountain Bluebird Sialia Currucoides 1543768 Mountain Bluebird Sialia Currucoides 1544