I had a bad infestation of them in my yard several years ago but my pack of miniature dachshunds took care of them in a few weeks. They would dig them up and bring them to the back door and drop them off for me. All I had to do was put them in the trash. I don't know how the dogs could tell where they were under the ground but they could zero in on them very quickly. I guess they could smell them or something but it was amazing to watch. I had a hard time getting them to come in the house they were having such a good time catching voles.
Bill
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