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.
Chickens are not know for being rocket scientists.
There's an old saying that locks only stop honest men from stealing. I stand here before you tonight to tell you that I have never met an honest raccoon. In other words, you have all the clocks and wrist watches on your and on your chickens'...