Over the weekend my wife and I discovered that we have an uninvited guest living in our attic crawlspace: an opossum. (This isn't a hoax.) As we were sitting on our patio we heard it moving around and soon discovered that it had found a gap (that we had never been aware of) in the side of the overhang above the kitchen door whereby it could gain access to the crawlspace. I rigged up a camera and managed to get a picture of it sticking its face out. So my question is, does anyone know what to do about an opossum in the attic? Will it leave of its own accord after a while? (We suspect it's been there for at least a couple of weeks.) Or do we have to get professionals out to remove it? I don't want to hurt it, because from what I understand they're fairly useful animals that kill rats, snakes, cockroaches, and other rodents.