rodent sighting

I just saw a large weasel walking around outside the main entrance to Bi Hall as I left it. It was not as frighening as, say, a squirrel, but it was not quite what I expected to great me when I went out the door. Wait, weasels are those fat white mangy things, right? I hope I have the right rodent. Oh, I just did a Google image search- I actually mean a possum. I am not accustomed to think for this many hours straight, my mind is not working.