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Those are beautiful nest boxes.
I think it would be better to leave the cedar unfinished so it can naturalize to a gray color which I find is more attractive to the birds.....unless you are trying to make them more attractive to humans.....to sell them.
I noticed the one you had set up was backed by a wooded area. Bluebirds generally prefer open field or meadow areas where the catch flying insects and can't be attacked by hawks lurking in trees. They are very vulnerable to aggressive house sparrows who will actually kill them to take over the nest box and I have seen them kill tree swallows and bluebirds in the nest and then build their own nest over the body.
I think it would be better to leave the cedar unfinished so it can naturalize to a gray color which I find is more attractive to the birds.....unless you are trying to make them more attractive to humans.....to sell them.
I noticed the one you had set up was backed by a wooded area. Bluebirds generally prefer open field or meadow areas where the catch flying insects and can't be attacked by hawks lurking in trees. They are very vulnerable to aggressive house sparrows who will actually kill them to take over the nest box and I have seen them kill tree swallows and bluebirds in the nest and then build their own nest over the body.
