I have three groups of 16 birds in three 10 x 10 pens. They say the arrangement is tight even when they get a good amount of free-range time. I have placed a saw horse and a 55-gallon barrel in each so they have elevated retreats. Each pen also has a wash tub with dirt for dust bathing and hay for scratching through. They also have extra roost poles so they can disperse at night if need be.