The Eastern Bluebird, (Sialia sialis), is a medium-sized thrush found
in open woodlands, farmlands and orchards.
Adults have a white belly. Males are bright blue on top and have a red throat and breast. Females have duller blue wings and tail, a brownish throat and breast, and a gray crown and back. Eastern Bluebirds are found in the Eastern US as the name implies.
Eastern Bluebirds typically have two broods in the northern portions of their range. It is common for them to have three broods in the southern part of their range. In the case of a warm summer that lasts later than usual, three broods can be expected even in the Northeastern United States.
The number of broods is mainly dependent on the weather and adequate availability of food (insects).
Eastern Bluebirds are cavity nesters and build a tall nest made mainly from grasses. The female lays two to seven bluish eggs that are incubated primarily by her. The eggs hatch in 12 to 14 days. The hatchlings are fed by both parents and the young ones fledge in another 14 to 20 days.
Blowfly larvae are commonly found in bluebird nests but it is rare for the infestation to cause death of the hatchlings.