Today I got 3 new hens that came from a flock of 12 but the rest were eaten by some animal. Well anyways I put the new hens into the pen with my flock of 5 hens and 1 roo. One of my hens was eating and a new hen came up and was getting some food too and they started to fight. Is that just seeing who is more dominant or acutall fighting as in gonna hurt one another? I have never mixed flocks before so please help me out!