I'm probably about to ask a very stupid question and I just acknowledged that so please don't belittle me. I've seen roo's fight in the pen and we just bought some new "hens". I know the difference between roo's and hens(so far). They are fighting with my other hens and look just like roo's do when they fight. Their necks are flared up and they are jumping at each other. Is this normal and will they hurt each other?