What do you guys think about these? I use the one with two floors for my gerbils. I thought at first they may be to small, but they made their own little nests inside and they seem to love them. They also pile up bedding on top of the the little stairs that fling open and close and go in the front doors, push open the stairs from inside their hide-away and burrow outside of the stairs!
My gerbil absolutely loves those things. He does the same thing with the bedding and seems to get amusement out of it. He tends to not like a lot of the other toys/things that I put in there for him, so I'm glad I found these.