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The key for a bluebird nest box is to have the hole be exactly 1.5 inches in diameter. Too large of a hole invites starlings and makes it easier for squirrels and other larger rodents to get in.
Eastern bluebird at the entrance of a nest box. A nest box, also spelled nestbox, is a man-made enclosure provided for animals to nest in. Nest boxes are most frequently utilized for birds, in which case they are also called birdhouses or a birdbox/bird box, but some mammals such as bats may also use them. Placing nestboxes or roosting boxes ...
Nest in a nest box The western bluebird nests in cavities or in nest boxes , competing with tree swallows , house sparrows , and European starlings for natural nesting locations. Because of the high level of competition, house sparrows often attack western bluebirds for their nests.
Also keep the nest boxes cleaned out so they are ready for a new nesting. If bluebirds have fledged their young, clean out the nest box right away so they can build a fresh new nest.
Among birds that nest in cavities but cannot excavate them on their own, competition is high for nest sites. Mountain, Western, and more recently Eastern bluebirds compete for nest boxes where their ranges overlap. House Sparrows, European Starlings, and House Wrens also compete fiercely with bluebirds for nest cavities. [17]
Obviously, having the nest box open from the front or the side is key. Can you imagine what a pain it is to help out the bluebird if the nest box only opens from the top?