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The powder-blue male Mountain Bluebird is among the most beautiful birds of the West. Living in more open terrain than the other two bluebirds, this species may nest in holes in cliffs or dirt banks when tree hollows are not available. It often seeks its food by hovering low over the grass in open fields. During the winter, Mountain Bluebirds often gather in large flocks, even by the hundreds, sometimes associating with Western Bluebirds.

The coniferous forest of the Pacific Northwest is the summer home of Townsend's Warbler. There the sharply marked males sing from high in the spruces and hemlocks; their buzzy songs are quite variable, and some are similar to those of the Black-throated Green Warbler, an eastern relative. Most Townsend's go to Mexico or Central America for the winter, but small numbers remain along the coast north to Oregon, Washington, and even Vancouver Island.

In partly open terrain of the west, from valley farms and orchards to clearings in mountain pine forest, this bluebird is often common. In summer it is often seen perching alone on fence wires by open meadows, fluttering down to pluck insects from the grass. In winter, small flocks of Western Bluebirds are often heard flying overhead or seen feeding on berries in trees. Sometimes, as when juniper woods have heavy berry crops, the bluebirds may gather by the hundreds.