20-ish years ago I took my ferrets to Midwest Bird and Exotic Animal Hospital. At that time one or more of the vets worked with Brookfield Zoo. The staff and ownership have changed since then, but they're still who the practice we take our dog to recommends for exotics. Website says they're currently on the Oak Park/Chicago border. No clue how they're located in relation to Metra/Pace lines.
http://www.midwestexotichospital.com
And as a bonus, all the doctors listed on the website are women, so much less creepiness risk. (Will not rant, will not rant, will not rant...).
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