I have a double level Critter Nation cage, and I have it full of hammocks, hanging tunnels, a space pod, an igloo, and little jingly balls as well as the occasional toilet paper roll, but I was wondering what else I can put in it for my group of girls to play with. I just got two very active little babies on Saturday night, so now I'm even more in need of toys, activities, games, things to explore, etc.! Thank you all!!