We have horse/cattle fencing covering over an acre. There was a section where the fence was not flush against our building and the chickens escaped from there into our neighbor's yard. He was not happy. So we sealed all the gaps. The fences are 4 foot high. Do you think they'll be contained - the issue is could/would they fly over the fence? We've only seen them fly in our barn to their nest boxes. We're a bit nervous about letting our chickens out in the pasture now and need advice. We want to free range them but not have them EVER go into our neighbor's yard again.