Bats DO have teeth, but they're not the same kind of teeth that other pest animals have, such as squirrels or rats and other rodents. In fact, if a bat were to bite you, you might not even know about it. The flying mammals eat insects that can have a hard shell, so their teeth are better suited to grinding down the shells of these bugs, rather than sharp teeth that can slice right into human flesh.
Oh, and just so you know; not even vampire bats — blood-sucking bats — chew or bite people. They live on the blood on animals like cows and pigs and they need such a tiny amount of blood to survive, they just wouldn't drain an animal in quite the way that horror stories might lead us to believe.
Chewing signs on your property doesn't rule out bats. It is very possible that you have a colony of bats living up in your attic AND a pack of rats living in the rest of the building. Rats are attracted to the dead corpses of other animals. They are scavengers after all. If you have one hundred bats in an attic-colony, it will only be a matter of time before you end up with one or two that have died, particularly around birthing season. It is rare for anything more than the minority of wild animal babies to survive the first few months. Those dead bodies attract flies and maggots, and it won't be long before they give off a nasty stench too — that's what'll attract other animals, such as rats. Those rats could very easily be the source of those chewed holes you keep spotting.
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