We have been feeding Robins with finely chopped peanuts (salt washed off)
and porridge oats. The mice have found it and brazenly come out in day time
to eat it.

To deter the mice we cut out the sides of a one pint plastic milk carton,
and fixed it to a bamboo garden cane about one metre high, but this morning
found what look like mice droppings in the new arrangement.

Can mice climb a single vertical garden bamboo cane only about four
millimeters in diameter? Or might these be Robin droppings?

Would there be a simple way to stop mice climbing up a bamboo stick?