The panic created inside the pen, run, or coop only encourages the predator outside the pen, run, or coop to double its efforts to break through the wire.I read a previous poster who watched two raccoons "double-teaming" his chickens. One raccoon would charge the wire and startle the chickens frantically over to the opposite side of the cage, into the waiting paws of the other raccoon. As much as I hate them, I have to respect their enginuity.