Predators in the area: dogs, coyotes, racoons, possums, armadillos, snakes, weasels, hawks, owls, bobcats....probably more that I haven't thought of. We will be using 2 x 4 welded wire, 6 feet tall and wooden stakes. One foot of the wire buried, turned outward. Hardware cloth up part of the sides and wadded chicken wire along the bottom. Two strands of electric fence-one close to the ground and the other a foot off the ground. The run will probably be 80 feet down each side and 20 feet wide. I was just going to put deer netting across the top since the chickens will be locked up at night. Hubby wants to put barbed wire in the trench and a strand of barbed wire along the top, but I am not sure what that would accomplish? Any suggestions?