I live in an area that has, and always has had, an extremely high wolf population. I won't way in on good, bad or indifferent as far as wolves go, but I am surprised about a jump in beaver populations. I would say that the beaver population grew in spite of the wolves, not because of them. Around here, wolves are serious predators of beaver, as well as moose and deer. Bears, as well as wolves, account for a majority of our moose calf mortality.