There's a lot of info about bats at www.batcon.org/ and info about bat houses at www.batbox.org . You could also check www.lads.com/basicallybats/index.html , and www.batworld.org/ and www.flybynightinc.com . Don't want George to get yaller fever or West Nile virus. But I've been hesitant to put up bat boxes because the only animal inside the city limits of Boise that has publicly afflicted with rabies was a bat. They do not require rabies inoculations for pets here, which I think a mistake. Margaret L