Another solution to the bear problem that I haven't seen so far is quite simple, and works well in the United States. If the bear is destroying hives and hurting a commercial operation, go to the state Fish and Game Department and talk to them about a depredation permit. Get the permit, take your rifle, and shoot the bear. I don't know whether this option is available to non-commercial beekeepers, but it's the best system that I have seen here in California. You just have to have the time to do it. Kevin