 I implore people that have bluebird houses up. It is not, you will not chase the birds away by opening it up and checking the nest. I've had, I mean, I have other people that do the same thing. They open it up. Number one, there could be ants in there that are, there's a lot of insects that can get in there. Ants that blow a fly that can crawl up the nest during the night and suck the blood out of the baby's wings.