So I've put up a screech owl nest box. Looking forward to getting some residents. Highly squirrel-proof. There are many screech owls in the neighborhood. Now I understand there is some risk of other birds occupying the nest box. How does one discourage that? Also, we have a horde of resident Mexican freetail bats, and people around here have bathouses aplenty, that look a lot like bird nesting boxes. Is that a risk, that bats will move in?