I guess that cage description could be a little confusing. It's actually a good sized cage, with a permanent divider in the middle. The divider then has a 4 by 6 inch hole in the middle (with a separate piece that can slide in and out to cover it up) to allow the animals to go back and forth ( I believe the original owner used it for breeding Chondros). But for me, it works out to make for a safe way to clean one side or the other.