. As the weather cools, moles will retreat into their deeper tunnels, often up to five feet beneath the surface. It is the soil excavated from the deep tunnels that resemble little volcanoes. https://blog.epa.gov/2015/07/27/excavation-experts-are-moles-or-voles-ruining-your-lawn-part-1/Wonders how deep moles/voles will dig?
also says they don't like clay soils... which is what I have.. so why don't they stay out in the pasture
