Great topic Vmax. Yes, LP Michigan coyotes are a bugger to call. I've experienced the difference from western animals because three times I've been to Colorado elk hunting and had an absolute riot calling coyotes in remote areas when I was there. They respond like crazy!
I'm convinced Michigan is the purgatory of coyote calling. One reason I know for a fact is that there are an untold number of food sources for any resourcefull animal. I've seen the tracks going to and from one particular trailer park I call near. I'm sure they are going in there and eating dog food off porches, garbage and even a cat or two. No yote is going to risk his skin chasing after the promise of a sound when he is full of Iams premium pet food! Any coyote that starves in the LP is retarded and needs to be removed from the gene pool. This is a big part of the problem. Not so in the western mountains where one meal might mean the difference between living and dying.
I've had decent success calling coyotes in Michigan, but it is a poor payoff for effort expended. I'm new to this site, but a veteran fox caller. One thing I will be looking for is specific techniques to get population center coyotes to come in. One thing I know for a fact is they shy away from roads. They have learned that sounds near roads means one thing; HUMANS and they might get exited, but won't close the deal. One tip I can certainly pass along is to walk deep into calling areas away from roads. Of course, it becomes much harder to enter undetected and there is a LOT of wasted time trudging through snow instead of calling. But, if that's what it takes....so be it. I'll just have to live with the reduced odds of only a few calling stands per outing.
Saturday I managed to call two within 25 yards after walking about a half mile down a power line into the heart of a good location. In deep snow it was a big effort, but worth in terms of results. BTW, they got away /ubbthreads/images/graemlins/mad.gif