Thanks guys but it is not a wire bottom cage, I would never let my rats walk on wire (they have semi carpeted cages w/ solid flooring.. luxery)! It is a pan but made of metal (galvanized steel I think). The cage fits right into the bottom pan. But anyways I got a great hint from another site about buying a rubbermaid box at the department store and using that as the bottom. I am going to do that and keep it as a spare cage as I bought a new martins cage today! I have another martins cage at home too but the rusted one I am not sure who that is made by. They are all large 3-4 story cages! I am moving the females into the new one, using the one that the females are currently in for my males (when I get them) and use the one I am searching for a bottom for for the babies when they come (when I get males to have babies).