Be careful, they could cum at you

https://www.salon.com/2023/11/26/these-bat-penises-are-so-enormous-they-cant-be-used-for-penetrative-sex-study-finds/

Could be. Their droppings are slightly larger than that of mice, and disintegrate under pressure. And whereas mouse droppings will tend to be by walls where they scurry, bat droppings will be under where they hang.

Bat droppings are toxic though, so I suggest wearing disposable gloves if you’re going to do any checking.

The solution to bats is to install egress tubes that the bats can get out of but can’t re-enter, then seal up around the openings that they’re using. Professional exterminators will know how to do this.