From WisContext.org:
As wolves returned to broad swaths of Wisconsin after decades of being extirpated from the state, a tracking program in which volunteers scout for the presence of this predator grew, too.
Since 1978, when the gray wolf (Canis lupus) was identified in Douglas County, the first sighting there in about two decades, the animal’s population across the state sharply increased. By the winter of 2017-2018, the minimum number of wolves in the state stood between 905 and 944, based on the annual count by the Wisconsin Department of Natural Resources.