Speaking of ferrets and mice, in my younger days I trained a mouse to run through conduit. At first, it was short pieces of pipe with peanut butter as a reward and he (she? I didn't check) got pretty good. On the first production try with a 2" pipe, I ran the mouse in the wrong direction. The run ended with a 5 foot drop into a live panel. After that, we could still use the mouse but we needed a vacuum.
