Check out this article in the Detroit Free Press about the wolf population growth in Michigan.  CB375hh and I were deer and beer hunting in Baraga (same area as the article talks about) county a few years back and had a wounded doe get shredded by a wolf. Check out the You Tube video on the middle of the page.

 http://www.freep.com/apps/pbcs.dll/article?AID=/20080602/BLOG01/80602050