2 of my girls are "fighting" as if they are cocks. They are 6 weeks old and ram each other as if they were roosters cockfighting. Now, I admit I have never watched a cockfight(and never intend to) and I am not 100% sure they are hens(even though they look like my other girls-20 weeks) Is this normal? They act just fine in the run, but when I let them free range they take off running and flying, but after a few minutes just the 2 start it. They don't seem to be serious and nobody gets hurt.