In captivity, Sugar glider typically nest in hollowed out trees. They climb into holes made by other animals, and nest in the hollows. This nest box mimicks the natural nesting techniques used by gliders in the wild. Entry hole in the front of box (1.75 inches wide) allows for easy entry, entry hole is sanded smooth with rounded edges. Top opens on a hinge for easy access to view or remove your glider(s). Attached hardware(included) allows for easy mounting to any cage. Our suggestion, is to mount the box higher in your pets cage, top corner of cage is ideal. Mount against top side of cage, so your Glider can easily enter the box from the cage side. When used for breeding, mount closer to bottom of cage in case babies come out, they can easily find their way back. Add some nesting material and watch your Glider build a natural nesting station! Size - 5 inches x 5 inches x 6 inches tall. Helpful hint: Line the interior of the box with waterproof shelve paper (the type used for kitchen cabinets that is sticky on one side and waterproof on the other).