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