I have 2 roos, both 20 weeks old, one slightly larger. Everybody was getting along great until a few days ago (only 3 girls in the coop/run at the moment. Out of nowhere the bigger roo started becoming increasingly more aggressive toward the little guy. I had to separate them for his own safety. A couple of days ago, he charged my friend, fully intending an attack....open beak, puffed up, wings flappin'.. Now today, he attacked me! ME, of all people, treat lady, feed lady, ice blocks lady, etc. All I did was open the gate on the coop. He actually drew blood. It's going to be a while til I can get my new babies in with everybody...they are still only one and two weeks old. The coop is plenty big enough for 20 chickens....Should I give it more time and maybe he'll get relaxed again when there are more girls? He ALWAYS let me pet him and stroke his wattle and rub under his wings. That's why I can't understand his behavior now!