Well, on the positive side - it's not a skunk

But it looks like we're going to have a rotting carcass in our house for a while. Bill, our nanny's husband, was nice enough to come over and check it out.... After smelling *whew* and looking around, it looks like it's probably NOT a skunk and he said that if it were his house, he'd wait to see how long it smelled. If it got worse, he'd come help us get it out. If not, we should just let the thing rot.

Lovely.