i have a maran that is bullying 2 of my chickens. one is another maran that has been with it forever and the other is a new wyandotte that just got put in with it. it has pecked feathers off my other maran and is going after the new one. any ideas on what to do to stop it? there are no open sores on the other maran that it is bullying, just missing feathers. i checked it good today.