The new ZILLA rock lairs are naturalistic decor Designed to be used not only as a dark Den for your reptile but also as a humid hideaway. Humidity is important in helping reptiles shed their skin and keeping eggs from drying out. A large Entrance provides easy access for the animal and also allows for fresh air exchange. The design of the entrance ramp and walls reduces light, mimicking a reptiles Natural burrow. The Mossy looking surface looks great and doubles as a rough surface to help with sloughing old skin.