Not really surprising. From what I have seen of rats, they are very good at spatial perception and physical manipulation of their environment, where they easily

Not really surprising. From what I have seen of rats, they are very good at spatial perception and physical manipulation of their environment, where they easily outperform most cats and dogs I have had the pleasure of knowing. A smart rat clearly enjoys exploration and challenge, and likes to be in control - it would appear more unexpected if these joyrides didn't relax them.