Everyone thinks chipmunks are cute, and so did I til recently. They have nested in my car's air conditioning and heating system--3 trips to the dealer so far. They are in the walls, in the attic, have devoured many of my garden plants. They dig from the surface down and eat any fleshy roots. They are living under my screened porch and they are afraid of nothing. How can I get rid of them? They have become a serious problem, not just a nuisance.