The Habitrail OVO Den is a fun add-on which gives your hamster another place to hide or sleep. Your hamster may use the Den as a toilet, and if so, you may choose to add another Den for your hamster to sleep in. The clear plastic of the Den"s roof makes it easy for you to see your hamster, while the retractable roof gives you easy access to your pet. The Habitrail OVO Den will make a great room in your pet"s home.