May be some are roosting in your house?
Bats are essential to ecosystems and there are non-lethal exclusion methods that allow to solve your problem (and keep the bats doing their necessary services to us - like pollination). We will soon adress this more into depth but you can download the brochure by Dr. Bruce Miller of the Neotropical Bat Project. This brochure also adresses some of the common misconceptions on bats.
