I have about a quarter of an acre fenced in on my property that we plan to put the coop in. The fence is about 4 feet high. I would like to let the hens free range for a bit during the day inside the fence. The coop will have a run but I'd like to let them out just so they could enjoy themselves. Should I be worried about them trying to fly over the fence or will they be to interested in foraging to care? I plan on getting barred rocks and I thought they would be to heavy to go that high but now I'm paranoid. I don't plan on leaving them out by themselves for long but I do have a toddler and he would take priority if I needed to urgently go inside for him.