Hamster wheels allow hamsters to run even though they don’t have a lot of room in their cages. In the wild, a hamster can run for several miles in a single night, but they obviously can’t do this if they’re confined to a cage. At least, not without a wheel…
With a wheel, your hamster can run surprisingly long distances without ever having to leave home. In fact, hamsters running in wheels have been known to run more than 5 miles in a single night!