When I was a kid, I had a series of rodents, including rats. I always thought it was really cool how my rats, when walking along a tenuous surface, would wrap (or attempt to wrap) their tails around the object (usually my arm) to provide themselves security from falling.

I don't know if possums do the same, I've never encountered one, but your "amazing creatures" interjection reminded me of that.

edit: Correct a word.