The Eastern Bluebird (Sialia sialis) is native to North America. It is predominantly found in the eastern United States, parts of Canada, and extends down to Nicaragua. During the breeding season, its range covers a significant portion of the eastern and central United States, extending into southeastern Canada. Overwintering areas include the southeastern United States down to Central America.

Eastern Bluebirds inhabit open woodlands, farmlands, orchards, and areas with scattered trees. They thrive in environments that offer a mix of open spaces for foraging and trees or shrubs for nesting. This species prefers areas with a temperate climate, characterized by well-defined seasons, but is adaptable to variations within its range.

Sialia sialis is primarily an insectivore, feeding on a diet rich in insects and other invertebrates during the warmer months, which helps control pest populations. In fall and winter, it supplements its diet with fruits and berries. The species plays a crucial role in seed dispersal and pest control, fulfilling an ecological role in promoting plant growth and ecological balance. It nests in the cavities of trees, often utilizing abandoned woodpecker holes or man-made nesting boxes. Its habitat requirements make it an indicator species for healthy open woodland ecosystems.