I have 22 RIR hens & 1 Rooster. All are free range all over my 5 acres. I don't even lock them in at night. So far the only thing that's bothered them is rat snake eating eggs. Going to make a pen & yard. I'm tired of poop everywhere & don't find all the eggs. Do you think they can fly over 7 ft high fence if there is nothing to step on to get over. The area is 50 ft. square.