Getting my first day olds in a few weeks. I have put up fencing to make a 20'x20' area outside of the coop for the chickens to spend their days once they grow up. The fence is standard post and rail with a maximum height of 4 feet. Obviously I have stapled wire to the fence. I have received VERY mixed opiions about whether or not the chickens will be able to fly over this fence. A co worker has 40+ chickens and says that they wont. Maybe on occasion one or two will get out but it wont be a real big issue. My father in law was in town yesterday. He grew up on a farm in Indiana and said without question, they will all get out and over the fence. So, what do all of you backyard chicken experts have to say on the topic!?