I selected "My flock free ranges > 1,000 sq ft/bird, and is only secure overnight." because I have a small flock of 7 adult birds (one hen recently brooded 7 chicks) (one hen is brooding 9 eggs), 2 almost adult birds, 2 juveniles (4 week old chicks, fully integrated into the flock), that live on my 1/2 acre that has chain link fencing all the way around but without any overhead security measures during daylight hours. Chain link is great for large predators, but does nothing to stop cats, raccoons, snakes and the like. Hawks and other birds of prey are commonplace here, but I have a lot of tree coverage. These birds live on my fully secured back patio at night.