Bat Conservation News is still emailing me, a missive I read intently, because I have much to learn.
So, while I do not think bats have much to do with nuns or monks (habits), the current Bat Conservation Newsletter is all about the trunks bats pack when they go back to school. I think a vampire bat would pack extra vials in which to store blood sucked but not consumed - a sort of bat tuck shop.
If I was a bat going back to school, I would want to suck up to my teachers. However, my teachers may not wish me to suck up to them, so I would have to clever. Any animal that can hang upside down all day and still manage to fly the right way up has life fairly sussed, or should that be sucked.