Will roosters kill other roosters? I have 2 banty roos, 10 mos old and 3 mos old. The older boy 2 days ago decided he wanted my little guy out of the flock. The first attack he jumped on the 3 mo old and covered him completely and was seriously at his neck with his beak. I thought that should be the end of the fighting thinking now my younger guy will stear clear. Well yesterday, same thing. Luckily I had a home for him to go to last night. But I am wondering, will a rooster actually kill another rooster? I know he would have made a bloody mess of him, but will they kill? He actually chased the younger down and would not stop the chase until he caught him.