The Midwest Critter Nation Cages come in both Single Unit and Double unit designs. These cages are specifically designed to accommodate pets and small animals such as Chinchillas, Ferrets, Sugar Gliders, Hedgehogs, Degus, and more. The design of the Critter Nation takes from the Ferret Nation many of the design features like the full open and removable doors, critter-proof door latches, large adjustable shelves with toy/bedding anchor points, wire ramps, and easy-to-clean and remove plastic pans. MidWest also designed the Critter Nation so that NO tools are required to assemble the cage. The design uses interlocking panels to securely lock the cage panels without the use of any screws, nuts, or bolts! Midwest's Critter Nation cage comes in two versions. Model 161 single level with stand and Model 162 double level with stand. For more pictures and details just click on either of the links below.