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Prairie Vole Surface Runways

Drawing of prairie vole surface runways with tunnel entrance hole

Voles build a system of well-defined runways both on top of the ground and underground. Holes about 2 inches wide lead from the surface runways to the underground tunnels. The floor of the runway is often littered with grass clippings and “paved” with soil excavated from the tunnels.

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http://mdc.mo.gov/node/25621