Going to put some chickens at my mothers house...she has 11 acres. Her yard proper is probably about an acre to acre and a half. How many chickens would be a good start for her to have a sustainable flock? I am new to free range chickens, as I live in a different location and have a small backyard flock in the city. I am going to build her a coop and just let the chickens free range...there are some a few dogs about a half mile away as well as the neigboor a few hundred yards away has a cocker spaniel, and hawks are around and that's about it as far as daytime predators go. Was thinking of either Barred Rocks or Black Australorps.