I have 3 young chickens, one is a black sex link and the other two we believe are black astrolorps (can't spell sorry). The two astrolorps go after each other, not sure if they are playing or fighting? How can I tell which they are doing? They pick at eachothers feathers and they will jump on one another and "fly kick" eachother. The black one seems to just watch them and they don't ever go after her. Is it normal or should I maybe separate them?