Ok, I have a 15 week old RIR roo and yesterday when I let everyone out, he started to do something that he never did before. He was the first one out and as the ladies started to come out, he randomly started biting a few. He did this to about 4 of the 18 ladies. He would kind of run up to them, grab them by the back of the neck, and yank out a feather or two at which they would screech and run away from him. So I'm wondering is this an 'I am dominant' thing with him or is this the 'I want to have a go' hormones kicking in?