Someone was telling me that when they started tree planting in Scotland (because once it was all forested and then was deforested, so they were reforesting for some environmental reason), the deer ate the trees (yum, yum, fresh shoots!). And when they planted trees on islands offshore to keep the deer off, the deer would swim over and eat the trees. So now that perhaps some trees have survived the onslaught of deer, they have to deal with beaver, who will cut down much larger trees just for the exercise, as well as use portable trees to make their dams and lodges.
Perhaps they should stock up on heavy grade chicken wire to protect the trees they want to keep (light grade isn't strong enough - the beavers go right through it).
I'm sure this will be quite entertaining from a safe distance. My dad has beaver both on his tree farm and at the cottage - they're really energetic little rodents, and rather hard to keep up with. Very karmic for those who are control freaks. 