Birdhouses

We have 24 birdhouses in our yard. Do you think there is a limit on how many birdhouses one should have? I can tell you this, 20 of them are occupied with house wrens, finches and chickadees. We even have a robin nesting in the lilac bush. The male birds are very busy bringing nourishment to the female birds who are nesting and waiting for their young to hatch. This is one of those times where we can view nature at its best.