I have 3 Orpington hens. About a month ago I got 2 Orpington pullets. The girls were not amused. I kept them in an extra large dog kennel. After a couple of weeks I let them out to see what would happen. There were some scary moments that I stopped with the garden hose. The pullets are terrified of the "mean girls". I am out here with them 90% of the time so I have let them be. More or less. The 3 hens stay together and the pullets stay together and do not intermingle. They free range so they don't have to be in each other's faces. Come bedtime, the hens go to the coop and the pullets go to the cage. Which is ok....for now. Of course as weather gets cooler it will have to change. Do you think they will work this out on their own?