We have a run, outside our chicken coop, that is made of chain link fencing and is six feet tall. It also has a standard gate entrance with extra wire around the gate so that the chickens can't squeeze through. There is no top on the run. Will this type of fencing keep raccoons and skunks out? There is one very close tree on the other side of the fence. Can a coon climb that tree and get over to the chickens?