Squirrel cages are also known as hamster wheels, rodent wheels, or exercise wheels. These cages are designed to provide small animals like hamsters, mice, and gerbils with a way to exercise and keep themselves busy. Some people also refer to them as running wheels, spinners, or turrets. Additionally, they may be called "silent wheels" if they make minimal noise during operation. Squirrel cages are typically made of plastic or metal and come in various sizes to accommodate different pets. Regardless of the name, these devices are an essential part of any small pet's habitat and contribute to their health and well-being.