or 2" sqaure weld mesh over the entrances, mine are cut the size of the tunnel and i leave two legs on the bottom to push in the ground to steady the mesh, it keeps out hedgehogs , birds and most young rabbits, that can be a pain in spring and summer, stoats rats and squirrels have no fear of hopping thru the squares, i also place the trap just inside the overhang of the tunnel , so that when a varmint hops thru the square it drops straight on the plate and you get clean catches,
Cant argue with that one.