Voles, often called field mice, are small rodents that resemble a mouse but a stouter and shorter. They are plant-eaters that primarily feed on grass and perennial-flower roots. Vole damage looks like little trails or surface tunnels that are lined with dead grass. Voles create these tunnel systems under the blanket of snow throughout the winter. As the snow melts, their little kingdoms become uncovered. However, damage will disappear as soil temperatures rise and your lawn starts to grow again. The voles will always be there, but you will have a harder time seeing evidence of them.