The scientists use a range of data-ratio of pasture to paved surfaces, population densities of deer, distribution of cattle-to reach their conclusions. For instance, the map reveals southwestern Wisconsin, a region with no wolves as yet, as high risk. "If wolves recolonize the area, there will be problems," says Adrian Treves, a WCS biologist. "Before, authorities responded only to actual attacks. Now we can educate people, control the problem and remove the fear."