My nephew called his mom and showed her a photo of the object hanging on his door. She recognized it as a bat!
After calls to the maintenance guy and with the assistance of friends, they captured the frightened little guy and removed him. My sister then used that episode to encourage a thorough cleaning of the apartment! My nephew and his roommate followed through.
Today I am pretending a bat entered my abode. Let’s see if that works for me?

Bats in the belfry! Basement and bathrooms!