There is an established Gray Wolf population existing in the Western Great Lakes states of Michigan, Minnesota and Wisconsin. There have been sightings and purposeful / accidental killings of dispersing wolves in the states of Illinois, Indiana, Nebraska, North and South Dakota and Iowa.
[HTML] Demographic and component Allee effects in southern Lake Superior gray wolves; JL Stenglein, TR Van Deelen – PloS one, 2016 – journals.plos.org
Human dimensions: public opinion research concerning wolves in the Great Lakes States of Michigan, Minnesota, and Wisconsin. InRecovery of gray wolves in the Great Lakes Region of the United States .Schanning K. 2009
Taxonomy, morphology, and genetics of wolves in the Great Lakes region
RM Nowak – … of Gray Wolves in the Great Lakes Region of the …, 2009 – Springer
Road density as a factor in habitat selection by wolves and other carnivores in the Great Lakes Region. Kohn BE, Thiel R, Hansen JL. Carnivore Conservation in the Twenty-first Century. 2001
Rabies in wolves of the Great Lakes Region. Theberge JB, Forbes GJ, Barker IK, Bollinger T. Journal of Wildlife Diseases. 1994 Oct;