I am so frustrated! Have had chickens for 3.5 years, but recently have a few that are repeatedly escaping their fenced area. The fencing is 8 feet high AND I have clipped their wings (one wing each). I am thinking about somehow tying lead fishing weights to their legs because I am at my wits end! They escape 7+ times a day. They cannot get underneath the fencing. What else can I do? Any ideas???