We had bats in the attic of a converted 19th Century mansion where I used to work. One secretary was terrified of them and worked on the upper level. I bought a lifelike rubbery bat that dangled from a thin string on a stick. After setting her up that morning by sayimg I saw some bats, I waited a couple hours before sneaking up behind her and bouncing the thing over her shoulder. Her scream had people running up from two floors below.

It's illegal to exterminate bats. They're the best weapon out there controlling the the mosquito population. They're nature's superheroes, rodents with wings.