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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.
Volunteers at Maybury State Park keep an eye on bluebird nesting boxes, watching for predators, counting eggs and fledglings.
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He conducted tests and experiments on ways to protect bluebird nest boxes from snakes and other predators. [6] He constructed a snake pit filled with black rat snakes to support his experiments and test predator guards. Results of those tests are referenced in a number of books on bluebirds. [7]: 57–59
The Eurasian blue tit will nest in any suitable hole in a tree, wall, or stump, or an artificial nest box, often competing with house sparrows or great tits for the site. Few birds more readily accept the shelter of a nesting box; the same hole is returned to year after year, and when one pair dies another takes possession.
The eastern bluebird (Sialia sialis) is a small North American migratory thrush found in open woodlands, farmlands, and orchards. The bright-blue breeding plumage of the male, easily observed on a wire or open perch, makes this species a favorite of birders.