We have six-week old silkies that we were going to let free range in a couple of weeks with larger breed chicks the same age. A friend said he lost all his silkies, because they do not do well free ranging. His experience was that they do not run or hide if a hawk or large bird flies over, and they are easy to pick up. Is this situation typical for silkies - do they need to be kept in an enclosed area? Can a hawk basically pick up any size chicken?