No,Binary,it ain´t a bat.It is a ghost!I love it when you ignore her for a long-long time, then wake her up. There's cobwebs all over the inside of her house. She's all messy looking, and makes a mean face at you before she leaves, slamming the door behind her. (I think I saw a bat flying around inside her house when this happened, too.)
By the way, other than what I wrote above, I think you need at least two of them for them to be any fun.