According to my National Geographic Field Guide to the Birds of Eastern Northern America, by Jon L. Dunn and Jonathan Alderfer, Eastern Bluebirds have been in decline in recent decades due largely to competition with European Starlings and House Sparrows for nesting sites, but the provision of specially designed boxes has resulted in a comeback.
Eastern Bluebirds have Chestnut throats, sides and flanks, contrasting white bellies, and white undertail coverts, making them one of the most attractive of thrushes.
They are commonly found in the Great Lakes regions in summer, in open woodlands, farmlands, and orchards, nesting in holes in trees and posts, and in nesting boxes.
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BarrytheBirder
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