I have noticed a clear difference in personality in my 4 pullet chick flock the last 2 days. 1 chick is ALWAYS the first to roost on my arm, with a second close behind. If one of the other 2 tries to be first to roost they quickly get put in place. Now They wait their turns. The 1 that is always first has also begun chasing the others at times. Its not violent however and usually only lasts a moment before they resume their happy play . I noticed this new behavior in them in the last 2 days. Is this them establishing pecking order?