Answer: Voles are tiny creatures, and are sometimes referred to as field mice. They don't dig tunnels or make large mounds, but they'll use tunnels made by other critters. Moles don't always make visible, above-ground tunnels, either, but can simply make mounds of soil, with a hole in the top, along their paths. Gophers dig tunnels and leave fan-shaped mounds with a hole near the edge.
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