One of the more beloved birds in North American, the eastern bluebird is common east of the Rocky Mountains and is the State Bird in both New York and Missouri. Bluebirds that inhabit Canada and the northern U.S. move south for the winter but those that reside throughout most the the central and southern States stay through the year.
While they feast primarily on insects during the warmer months, eastern bluebirds shift to a diet of berries from late fall through early spring; wild grapes, chokecherry, sumac, cedar and juniper berries are among their favored foods. And while they pair off in spring and early summer to raise their young, these sociable birds form loose flocks for much of the year and may roost together in tree cavities or nest boxes to conserve heat in winter.
Eastern bluebirds favor wooded meadows and farmlands and often gather on powerlines or fences. Come spring, potential parents look for nest cavities in trees, fence posts or man-made boxes; competition for these sites comes from tree swallows, starlings and house sparrows, posing a threat to the welfare of this attractive and beloved native.