We have a secure area for the girls, covered and all to keep the hawks and resident owl at bay. That area is only about 400 square feet and we're going to extend the run using one existing fence line and putting new up to the tune of 400-500' of fencing. Our main predator is the coyote, but really have a combo platter. So if I run a strand of barbed wire on the top of the ground , 6' of 2x4 fence mesh and a strand or two of barbed above- does that sound about right? Thanks.