 please, just monitor it, open the box, you can look at it. Actually, what I do is, what I did in the beginning, I don't anymore because they're used to me. I have mine at the bottom of a bank where I have my flower garden, so they're used to me. But as you're approaching the box, just whistle or make some kind of a noise that if there is a bird in there, and I'll tap on the side of the box, that they have time to get out, and then they'll come back.