This publication offers information on building materials, construction, when and where to place box, and competition for nesting space. Also suggests ways to protect from predators as well as maintenance of nest boxes.
One small recommendation on page 3. The cut between the side and the roof should be 90 degrees, not angled. If it is angled, the side has a gap where it meets the bottom.
Overall, very nice info for building a bird house that meets the needs of my local birds.
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