We've been watching with great interest the former bat-cave that was the front eave of our home. One night 47 bats, the next, one.
One bat? Bats are not generally lone wolves. They prefer to live in colonies.
Leave it to me to be harboring a sort of Unabomber/Serial Killer of the species. I have visions of him living up there, plotting his revenge. The Lee Harvey Oswald of bat-dom.