We have a black bear that has just moved into our area and I am concerned that it is going to tear our coops up to get to our birds. The coops are predator proof for all normal predators but a bear is a different story altogether. I was wondering what type of electric fencing others use and have found effective against bears? I want something that is as cost effective as possible but not at the expense of deterring the bears! What have you got that works well and didn't put you into debt!?