A cow, Amos. And perhaps other animals later.

I pulled out my leather working stuff and found I only have one postmortem needle left. They are the finest leather working needles I've ever found since they have a triangular "cutting" point that penetrates the toughest leather.

So for the nonce I'll be sewing a dead cow. I also have some skin from a dead deer, come to think of it.

Besides, you can never tell when you might be called upon to do an autopsy. Do you know how they get to the skull so that the brain can be removed? Would you like to learn?