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This is a design that is extremely Sparrow and weather resistant. One of the top Bluebirders in Pennsylvania uses this box almost exclusively on his trails.
Peterson Bluebird House
Square PVC Bluebird Box
Sparrow Resistant Bluebird Skylight Box
Sparrow Resistant Bluebird Slot Box
TREX Bluebird box with cedar roof
NABS Bluebird House
F&M Front opening Bluebird box
Introductory NABS Kit