Without a doubt, the wolf. You can hunt them as a game animal here in Alaska and we have many of them but they are RARELY taken except as an "accident" while hunting other species.
They are extremely cunning. A few get taken by calling, but they are so wary that they'll normaly do a complete circle around the caller beyond rifle range and find your trail into the blind.
I have nothing but respect for anyone who takes a wolf by fair chase means.
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Keith
The Bears and Bear Maulings Page:
members.xoom.com/keithrogan