> any one has ever expanded or added to their cage We started with a medium 2 level cage. When the herd grew we bought a large 3 level cage. When the herd got to 10 I desided they needed more room so I connected the old and new cages with 4 inch drain tube. The cage connection was done with a rectangle to round piece that looks like it was intended to join a gutter downspout to the round drain tube. I cut the wires so that some of the wire would poke through holes I drilled in the adapter. Once you have adapters in each cage its simple to add elbows and strights to connect the two cages. I ended up adding a tee to a rice box so they have a play area connected to both cages. Usually they spread out between the two cages but occasionally I have found all ten in one heap in the small cage. I can send pictures if you like. [Posted in FML issue 4138]