Do guinea pigs like the rodent wheels and big plastic balls?
Do not buy rodent wheels for your guinea pig, even if they say “for guinea pigs.” Guinea pigs are simply not made for them: they can easily break a foot in a rodent wheel. Those big plastic balls are marketed as being ideal for guinea pigs, but guinea pigs will sit, terrified, in the ball. This plastic ball is too disorienting for guinea pigs; it cuts them off from their environment, and doesn’t allow them to really see where they’re going. It’s much better to just let your piggy roam in the kitchen, with a few towels thrown on the floor.