Runways. Rats take the same pathways, called runways, over and over between their burrows and their food sources. The runways may extend over several properties, as rats may live at one location and feed at another. This repeated movement leaves certain signs that make it possible to identify rat presence and locate their burrows or food sources. Runways are generally located along a vertical surface such as a fence or wall. They can take the form of tamped down plants, dirt paths where plant life has been worn away or packed down earth. The oils on rat fur can also leave dark marks on surfaces that they frequently rub against while traveling, such as fences, walls, or the lattice under porches. View Image