My parrots fight all the time. Ana Grey, the smallest in the boss, she always has been as she is fearless. Although the other two are larger than Ana Grey she is the quickest and the one in charge. I watch them constantly. Ana Grey "owns" my left shoulder and my right shoulder is used by either Sterling Gris or Louie. It's funny to hear Sterling Gris, the youngest but largest of my parrots, scream when one of the other two "pick" on him. The funny thing is that they never fight in the bird room or when I am away from them. They do understand the meaning of "no fighting" because they are always into trouble about picking on each other and always stop the moment I say, "no fighting". They never really try to hit each other just get the other away from where the other wants to be. Ana Grey is usually the "winner" as she is the most aggressive and has I said, the quickest. None of my parrots bites me when I give one of the others attention, they fight each other, not me.