I may as well bump this back up....
I won't even pretend to know much about these things, nor understand their biology but I do know that I have now joined the ranks of those who have trapped one.
I spent an absurd amount of time researching various areas, spending gas money looking for where one was habitually hanging out, checking out GoogleEarth and whatever else I thought would help me find one.
It all paid off today.
The catch circle looked like those I have seen from wolves. That place was TORE UP.
Neat critters, no doubt.