Holy Myotis, Batman!

There's bats living in our lab building!

A bunch of us were studying in there this evening when they woke up and left to go hunting. A few straggled behind. I didn't manage to get any good pictures, but they'll be back. They live in the walls.

I'm fairly certain they're a species of Myotis, probably Myotis californicus. It's the most common bat in the area. I'm not putting any money on it, though; I'd need to get a better look at the little fella.