This complete habitat features a removable exterior ball to provide your furry friend with hours of fun activity both in and out of the cage! The habitat also features Look-Out Tower which provides a nesting spot and easy interaction with your pet. The Run-about Habitat also comes with a food dish and water bottle for your convenience. The front wire door allows you to easily access your pet at any time. Ideal for mice, dwarf hamsters, hamsters, and gerbils.From The Manufacturer:CritterTrail is a connectable & expandable system designed to grow with your pet. We suggest you start with a habitat that has everything you need to make your pet feel right at home. Each of our CritterTrail Habitats includes a food dish, water bottle, and exercise wheel. All CritterTrail habitats are expandable and designed to connect to other CritterTrail habitats and fun-nel tube accessories, creating an unlimited amount of living space for your pet hamster, gerbil, or mouse.