Hamster balls are plastic hollow spheres in which hamsters, gerbils, Guinea pigs and other small rodent pets are placed in, allowing them to run around outside their cages without the risk of getting lost under furniture or in walls.
Most hamster balls are made of durable, transparent plastic with air holes and a small door or lid to allow the owner to insert or remove the hamster from the ball.
Although hamster balls are designed to protect hamsters, there are hazards such as stairs and other high places from which hamsters can fall, resulting in injury or even death. It is advised that any hamster owners with hamster balls must keep them on the floor on the lower levels of the house, away from any stairs. Children should not throw, drop, or bounce hamster balls.Template:Rodent-stub