I purchased one of the ferret highways a few months ago and our little masters love it. Yesterday I tried an experiment that worked very well. Those Flex-e Fun-nels that you can also find at Petsmart are the same diameter as the Highway, so I attached the two to each other. The kids love it and now they can run all the way around the outside of the room at hi speed. A bonus is that the tunnels fit into the corners...which means there is no way that they are going to poop there. Dooks to all, Jalene [Posted in FML issue 2661]