I found a bat cave on the property of the little German lady we had our deer lease with down in South Texas.Darwin award material - don't bugger with bats, period. Too many disease possibilities, many of them serious. Trust me. I was a biologist. From government.
I really didn't venture very far into it because of the ridiculously stinky smells ! Holy crap!
It was a pretty big one but nowhere near as big as the bat population that hides under the bridge going over the Brazos River there in Austin.