Research > Eastern Bluebird (Sialia Sialis)
1
Bluebirds occur throughout much of North America. In the spring and summer they look inside the small holes of branches and tree trunks to build their grass nests. Occasionally, they will choose an exposed cavity or a broken tree snag that is open on top.
Image: Bluebird on a snag.
2
In many areas natural cavities are missing due to the downing of trees or have been eliminated due to tree pruning. Nest boxes may be put out to simulate natural wooden cavities and are often accepted by bluebirds.
Image: Bluebird pair on Native America nest box.
3
The house sparrow is a recent inhabitant of this continent and has competed viciously with the bluebird often killing young and adult birds while they are in the nesting cavity. Those nest boxes with open tops may help to disinterest the house sparrow from competing.
Image: Bluebird on Native America open-top style nest box.