Super Pet Hi-Corner Litter Pan Petsmart (store only, not online) - $5.99 Product Description: Who likes to have an ordinary litter pan dominate the appearance of their pet's home? The uniquely designed higher corner handles animals that like to back up into the corners of their homes and keeps messes inside! It also saves valuable cage space. RattyRat's Review: If your rat's cage is large enough, you can hang these in the upper corners of their cage. They are great for adding some extra climbing spots for your rats to climb to and perch on. We line the bottom of ours with litter to make them easier to clean. And you can of course use these for their intended purpose - as litter pans. :)