I have read alot on this subject but i still have a question on chicken that fly over fences (even with clipped wing). Is it possible that they dont feel safe or they miss something in the backyard were they live and that why they try to jump over the fence ??? Or maby chicken or like dog ?? for any reasons, some dog will stay in the backyard even with the gate open and some others will dig, jump, and try anything to escape !!!