I have a pen occupied by several approximately 2-month old seramas. I also have (had) a few other chicks in the same pen of the same size. About two weeks ago, I put a silkie chick in there which had been previously housed with them so I figured they could still peacefully cohabitate... I was wrong, I stepped away for about an hour and returned to find they had pecked off his oil gland, SO, I thought must be a territorial thing they don't want strange chickens in their "flock" Yesterday, they pecked the oil gland off a cochin chick which has been living with them for over a month now. TODAY, they pecked the butt off of an orpington chick which has been living with them since their arrival. Will this ever stop? What should I do? Drive a stake through their little vampire chicken hearts?