October is Bat Month, and it's a good time to make sure they are not roosting in your house. 

The Humane Society has tips to evict them before winter hibernation. Bats are a major predator of night-flying insects, including pests that cost farmers billions of dollars annually. But according the the CDC they pose the biggest rabies threat in the U.S.

Most bats are not rabid, but you may not know if one bites you, and rabies, which can be passed along to humans, can only be determined by laboratory testing. Meaning, there is concern about our exposure.