I have two Buff Orpingtons and one Easter Egger that are 18 weeks old. I have never once seen them actually fight or even seriously peck at each other. After some of the horror stories I've read here I'm convinced I have the most well behaved chickens in the world. Inside their 10 x 4 tractor they act normal but AS SOON as I open the door to let them free range they come charging out like their coop was on fire and then the head BO and the Easter Egger do the chest bump thing where the hackles raise and they see who is taller. The Easter Egger always backs down and there is never actually any contact made or even squawking and everything goes back to normal. It seems to me to be a pecking order thing but why would they only do this when free ranging? I have never seen them do this even once when in their tractor. They still get along great and I'm not worried, just curious.