I have a 4 week old Khaki Campbell female that is being a real bully to everyone else but especially to the other Campbell and one of the Rouens. She keeps going up behind them and biting their tail feathers and making them squawk really loud. They aren't crowded and have plenty of feeding and drinking space. She does it when everyone is out of the brooder playing too. Is this normal? A bad sign? Do I need to find her a different home? Advice please.