I have 8 girls, one of which is a BR. She is the youngest of all the girls. She was the smallest as well and was chased around as a baby (I Named her Delta as she was flighty). I now have a little rooster and he is separated in a large dog kennel but in the coop with them. When I let them out, I let all of them out and Delta constantly will chase and challenge him. Many times he stands his ground, esp. If its just her but if another one is nearby he will dodge he will run to safely or to me. I have wondered about her aggressiveness to him. She is also running up to other girls and it's as if she is trying to prove herself to them. As I typed this she just did it again and my Little Man stood up to her.