We have three rabbits in a pen on the balcony. For a couple of days, a mouse has been joining them, eating some of their pellets and — more worryingly — leaving some droppings in the food bowl. How can we prevent the mouse from coming in, or at least from pooping in the food bowl?
Background: The rabbit pen consists of wire mesh on al four sides. On three sides, it's a square mesh with 16mm square holes, on the fourth side the holes are a bit larger. When I went to feed the rabbits last night, that is also the side where I saw the mouse come from, although this could also be coincidence as that is also the most sheltered side.
We usually give the rabbits their food in the late afternoon/early evening, feeding them out of our hand before leaving the bowl there for them until the next feeding time.
My first thought was to screw a 40cm board to the side with the large holes and see what happens, but would that be enough? Or do you have other, easier suggestions?