Thats a good idea on the predator and prey thread thing, and no sadly I don't think I have a hen thats taken to flock leader. I have both ducks that keep a look out and when they run for cover the chickens usually, sometimes , would but Dave started attack the chickens so he's up when they're out and Lady doesn't give off a warning sound or anything when she spots a hawk She just lays down where she is when one flies over. I have done the CD thing in a few trees but we've got a fairly big yard and all the trees are on the edge, and the chickens spend time in the middle where there's no cover. I just wish they'd go after things besides my feathered babies!