That is rare. I never found a dead cat or a dead bear. Did find a bear skull once, like a moron, I put it on a stump and left it. I would just go get your game regs and look and see if you can take the skull. In MT, we aren't able to take the skull unless it becomes naturally detached from the carcass. Is it in a place where someone else will find it? That would suck waiting around for the birds and bugs to do their work.