I have 2 hens (a Rouen and a Pekin duck) and also 6 hens (chickens) During the day they all roam around my yard and all seem fine...but I was just wondering if they could actually stay in the same pen at night or during the day when I'm not home? Could they hurt each other? I have no drakes or roosters. All are females. In the meantime I have been keeping them in separate pens.