So I have my hamster's cage ontop of my bureau (which is against a wall). The bureau's about 3.5-4 feet tall, when my hamster stands up he's maybe 4-6 inches. I was letting him run around my room while I was working (no ball, he doesn't chew on the wires and he likes it better). Suddenly, I hear the plastic bowls I keep on the top of my bureau fall over. I go to check it out and there he is! He'd shimmied his way up the back of the bureau, no ledges or anything to grab onto, just a paw on either side of him. It'd be like me shimmying up a 5 story building! I know physics play into it, he had less weight to pull up, but I always used to think that hamsters were the fat nerdy members of the rodent family. But mine's turning into a beast!