It must be that each bird of course has its own personality, b/c my wyandotte is the one that got picked on, literally pecked at, in my flock. My Rhode Island Reds are the troublemakers. We have a very large piece of property that we free-range them on, and the entire property is fenced. They insist on jumping over the fence and always end up hanging out with my neighbors when I'm not home. This is not normally a problem, but sometimes when my neighbors would have company, my RIR's would hop in their cars and try to leave with them! (they love jumping into my truck when I get home, I don't know why!) So, my solution was to clip the wings of my RIR's during spring/summer. My buff orpington and wyandotte never leave the yard on their own, only occasionally if the RIR's would do it.