The eastern bluebird's range is the eastern three-fifths of the United States. It is commonly found in places, such as farmlands, orchards, park areas, open fields and near wooded tracts of land.
The mountain bluebird, designated the state bird of Nevada and Idaho, resides in mountain meadows in the warm months before moving down to lower elevations with the arrival of winter.
The western bluebird, found in the western quarter of the United States, will often receive help from swallows in defending its nest from danger and feeding its young.
Eastern and western bluebirds have suffered from competition from the house sparrow and the European starling for nesting spots and helped by nest boxes provided by conservationists.
Of the three bluebirds, the mountain bluebird has its whole body covered in varied shades of blue while the other two types possess a reddish breast and white belly along with a blue back, head and wings.