Scientific name: Sialia sialis
Famed in literature, brilliant in color, and popular for its readiness to accept hands-on help from humans in the form of nest boxes, the Eastern Bluebird is celebrated with whole organizations dedicated to its study. Because of its relative tameness and the ease with which nest boxes can be studied, there is a large body of data and scientific literature on the Eastern Bluebird.
Some birds withdraw from northern breeding areas during the winter, and migration takes place by day and usually in groups. During the breeding season, their nests are seldom parasitized by the Brown-headed Cowbird because most cavity openings are too small. Bluebirds have been known to lay eggs in the nests of other species such as Carolina Wren and House Sparrow.