I have 12-20 week old pullets and a rooster. Friday I added 6- 1 year old leghorns. The pullets wont leave the leghorns alone. Poor leghorns won't come out of the coupe. When they did they all hudled in a corner. The rooster seems to be aggressive towards them too. He has always been a good boy. I have plenty of coupe and run space. Yesterday they seem to get along a little better. I'm just hoping it improves. Wife and kids are not happy about the leghorn feathers getting picked. Somebody tell me what I want to hear.....They just need a little more time??? I'm surprised the young girls are so aggressive.