This is a video demonstration of how a roosting bat pees — by flipping to hang upright, opening the floodgates, then giving a good shake before returning upside-down. I didn’t expect the shake, but that’s smart — I imagine there’s nothing worse than dribbling urine in your face after a pee. “It’s true.” Batman, everybody!

Thanks to JustA, who agrees it’s probably best that bats leave peeing upside down to professionals like myself.