Wildlife officials warning black bears sightings are increasing around southern Minnesota. The shaded areas on the map indicate where there have been sightings in the last week. It includes nearby Rochester, as well as Fillmore County and St. Charles. Nelson says the bears probably are young males searching for mates after swimming over from Wisconsin. Usually black bears are only found in the northern part of the state. The DNR also saying black bears are typically wary of humans and not aggressive.