I understand that one of the things that set us primates apart from other fauna is our opposable thumbs.

Now, I've been watching squirrels eat nuts. Sometimes these nuts are so huge the squirrels have to whack away at the shell for a while before they can get to the good stuff. They hold these nuts in their hands and it looks to me like their 'thumbs' are doing much of the rotating work. In other words, they look opposable.

Dr Bill (or anyone else), can you supply any info on this?