Had to build the ultimate mouse death trap. Cant use poison because my doggies would find it and that would be bad. Conventional traps mean removing mouse 1 at a time. Plus this is great for the ever pesky chipmunks. Little antifreeze in bottom. Water would work, but freeze and I prefer them to die a painful death as to all the crap they have chew to poo Peanut butter on pop bottle that's drilled for a small rod and spins. They run up the board, jump to the bottle and spin to their death !!