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Nest Boxes
BRAW recommends using nest boxes that have proven to be highly attractive to bluebirds. These boxes are shallow (4-5” from bottom of hole to nesting platform), narrow (4” x 4” nesting platforms), have oval openings (1 3/8” x 2 ¼”) and are unvented (vents can be opened after June 1 in areas where black flies are not prevalent). Any box that meets these specifications is recommended by BRAW.
The three most productive boxes recorded by BRAW in order of best to least are: