My BBRs are the ones that start the sparing matches. I have had to move mine out of the pen several times because of their fighting. My silver cockerels are not as bad but like you said, my pullets sometime start sparring matches with each other. I have a black langshan cockerel in the pen that is larger than the rest and he puts a stop to the fighting before it gets out of hands. It is funny to watch. They are the same age and the langshan is twice the size of the kraienkoppe. The smaller cockerels don't mess with him. The langshan is my daughters pet. It wants to be petted just like a cat and will follow you under your feet to be picked up. My first set of birds are 11 weeks old and I let them out of their coop for the first time yesterday. They went crazy. My daughter came home and freaked out when she saw all the chickens running loose. She put all of them back in the coop. I have one little kraienkoppe pullet that will not grow. I had to seperate her from the rest at an early age because the rest picked at her. I have some black sumatra bantams that I hatched out that are a month younger than her. She grew up with them and the sumatra bantams are larger than she is now. I quess I might have a start at a bantam kraienkoppe with her.