We've just moved and back on to a wheat field. The garden is densely planted with shrubs along the sides. Theres an odd patch at the bottom of the garden behind some fencing, ground is soft and spongy with just some weeds. Area has some empty compost bins and an old empty shed. Rat city down there! Lots of holes, and some holes going under the concrete path nearer the house. Probably under the shrubs too. We rent and arent allowed to remove plants (not that we want to). We dont want to use poison or traps, cant find any local ratting terriers. Other than generally moving stuff about to disturb them, any failsafe ways to get them to move out?