Yes they do, dont they? I.. I mean my Mom has 1 or so female rats she LOVES.. and the boys And well we keep them in 20 gallong longs, with the females top off and a large wheel in there. they LOVE the wheel. Something I would recommend to any who has rats. They dont like the mice/hamster wheels, they are too small and closed in, a wheel with both sides open. We use wire-like wheels, that we bought from petco. Our adult and young rats LOVE the wheels.