Our chickens are 9 weeks old tomorrow. Sixteen hens, one definite rooster, and one suspect, lol. The past few days they have been what looks like arguing and fussing. They don't actually do anything to each other, but they fluff up and stare at each other, then one will turn around and walk away. I assume they are working on their pecking order? Also, the little rooster has been crowing for a few weeks, and he seems to be trying to practice mating. He'll jump on a hen's back, grab her neck, then she'll shake him off and fuss at him. Is this normal for this age?