I bought Bob a new bluebird box for Christmas. This one has a plexiglass inside wall so you can open the box without disturbing the nest to see what's going on.
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The other side opens so you can clean out the box when the fledglings fly away.
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It also has a copper ring around the opening so other birds, like woodpeckers can't enlarge the hole.
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So, here it is all new and clean and ready for one of our sets of bluebirds to occupy it.
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We've had at least 6 bluebirds at the bird feeders this winter so with any luck we will get two pairs of bluebird nests this season.