I keep goats (wheaters) in with my chickens and have had no problem with predatory birds. I have seen them circle and leave. I think they are not so sure about stealing chickens in the presence of goats. I have two goats in with them by the way. At feeding time the goats are put out in an area of their own next to the chicken coop so they don't eat the chickens food as the goats can be little piggies. I have it separated with some electric fencing. The chickens can come out and hang out with the goats and they do all the time. They are the best of friends. Sometimes the chickens will roost on the goats backs in the hen house and the goats don't mind a bit. One of my goats is a Lamancha and the other is a nigerian dwarf. Both are very sweet tame animals and are not scared of everything. Both are pretty outgoing and still like to play at four years old. Very gentle with the chickens and ducks, however they do make contact with the geese when playing. Just the Geese though. I think they make a great combination and are mutually beneficial. They have gotten along from day one and I do feel that the goats look out for the chickens, ducks, and geese. I have noticed that my goats seem to have a favorite chicken "Blondie" as she is always with them outside and in the chicken house. She follows them around everywhere and stays real close. Real cute.