Found that I have voles eatting things in my back garden. Tomorrow I am off to get poison bait to off them. The articles I have read said they can overtake entire yards and make a big mess. They ate all the Lilies there as well as 200 tulips and gnawed a trees' roots to a pencil point stick. Said you need to kill them, not repel them...then they just move to a different area of your yard. Oh joy!