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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.
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.
Bluebirds have two or three nestings per year so do not give up trying to attract them. Keep monitoring your bluebird nest boxes and make sure that they aren’t occupied by house sparrows.
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 ...
Monitoring bluebird nest boxes is important. If you are checking on bluebirds I suggest you do it in the early part of the day – never in the evening! Your human scent will only attract the ...
Predators of young bluebirds in the nests can include snakes, cats, and raccoons. Bird species competing with bluebirds for nesting locations include the common starling, American crow, and house sparrow, which take over the nesting sites of bluebirds, killing young, smashing eggs, and probably killing adult bluebirds. [6] Male western bluebird
Fledglings then leave the nest 15 to 20 days after hatching. [11] Juvenile (left) with parent Eastern bluebird at nesting box Eastern bluebird in Quebec, Canada. Both parents cooperate in raising the young, which they feed a diet consisting almost entirely of insects. Some young stay around the nest to help raise another brood.
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]