sparrow resistant bluebird house slot entrance
Slot 1-12 entrance hole. Consider using a PVC-style bluebird house like the Gilbertson nest box.
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Troyers Sparrow-resistant Bluebird House SRBH Why the SRBH is Sparrow-Resistant. Set up your nest box in an open area away from houses and barns. Their robust construction and bluebird-specific design make these shelters some of the best available and will surely help bluebirds thrive.
Male sparrows can not block entrance and trap the female Bluebird during incubation. After discovering a pair of House Sparrows nesting in one of my bluebird nest boxes some years ago I searched the Internet for information on how to make a nest box House Sparrow. The slotted entrance lets in sunlight sparrows want dark cavities not bright ones.