I've got 30 birds. 5 of which are white crested black polish. There are 4 old hens & the rest are 4 or 5 months old now. The old hens like to pick on the chicks but they have figured out to get out of the way & for the most part no one gets into any trouble. Except the polish. They are nearly blind & sit there looking at the ground & don't see the old hens coming until its too late. So I finally decided to move them out. I had some old scraps of plywood & cedar & a couple sheets of corrigated plastic for a roof. I built a 2x6 mini coop with a chicken wire floor for the polish & moved them into the garden. The garden is the only other place with a fence that I'm reasonably sure will keep out some preditors. We will see - in any case they have to be happier on their own in the garden vs getting pummeled in the run.