The trick to making this work is weighting down the rod so that only the can turns. Using the wooden ramp for the mice to have easy access to the peanut butter also holds the rod in place to the can rolls with the mouse.
Since I have young birds who like to fly up on the rims of five gallon buckets to see what is inside, I wrapped 2 inch chicken wire tower around my bucket....the mice can go thru easily, but the birds cant have access.
Hi NanaKat: the hole I drilled in the bucket are nearly undersized for the dowel, and I had to drive the dowel through with a hammer. I thought about the chickens wanting to check out the bucket. Your tower of chicken wire is a good idea. I'll top the bucket with it, and won't have to worry about curious chickens falling in.
Sage