Can bats live in the attic?

Bats look for warm, protected places to roost. An attic with a small opening is perfect for the bats. However, people would generally advise against allowing bats to live in the attic. One, they poop, like most mammals, which creates a disgusting and insanitary mess. Two, there is a chance they could spread disease to humans (although the odds are low). Although I wouldn't recommend letting bats live in your attic, they are awesome animals and I would highly recommend providing a bathhouse for them. If the hang from the underside of your roof, outside of your house, that's fine too.