A policeman came and confirmed that, indeed, the hole was made by a bb. The weirdest part is that Wilbur didn't react much at all when we went out there to investigate right after it happened (he goes batshit crazy when strangers are around). It might have been stupid to run right out there after it happened, but really my first thought was not that someone shot my house! I figured a bird flew into the window or something. Nope!
I know it was just some dumb kids, so I'm not too worried about it, but sheesh! Who shoots a house? And who shoots one bb??