Guest
In my mind, rats are too social to be placed in a ball at all, to me it's just mean. They are just fine to let out in a play area where they can jump, hop and run around in comfort, balls are not needed. Hamsters are small, so when they are standing on all fours in a ball, not moving their backs are not curved, but rats are much longer, and their backs are always curved ..not to mention the tail & toe nails can get stuck and ripped off easily in thoese holes.