Troyer's Birds' Paradise Authorized Reseller, Purple Martin Bird Houses, Troyer Gourds and Gourd Racks for Sale
Why the SRBH is sparrow-resistant: The slotted entrance lets in sunlight, sparrows want dark cavities, not bright ones. Male sparrows can not block entrance and trap the female Bluebird during incubation. Also the nest tray takes cubic inches away from the cavity which also discourages sparrows.
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