I seemed to remember that Clinch Park Zoo had some Mexican Gray wolves, possibly on loan, so I went agoogling. Here are a couple of links for you. Looks like Traverse City's Clinch Park Zoo is going to lose out to the money-grubbin' "we need a bigger marina in downtown Traverse City" powers that be.

http://www.foranimalstc.org/clinchpark.html

And another take on moving the zoo:
http://www.ci.traverse-city.mi.us/services/nov2002.htm

A link for more info about wolves
http://www.defenders.org/releases/pr1999/pr101599.html