The chicks are about 4 weeks old I had 5 Brahma(all Pullets), 3 Cochin, 1 partridge rock a mystery chick and 6 wyndottes a week younger. All seemed to have very even calm temperaments handled daily. I sold a friend a cochin and 3 Brahma, her pick. She called the next day and said one of the Brahma chicks was a terrorist, biting her herding the other chicks away from her chicks. I mean really biting and holding on! So we gave it a few days and nothing changed. I told her we would swap out chicks so yesterday we did. Holy Smokes! She is awful. Bite me on the inside of my wrist and left a mark! I haven't seen her attack the other chicks but can't say she hasn't. I walked around with her in my arms for about a half hour this afternoon. She never relaxed. Put her back in the outside pen with the others for awhile. When I went to pick her up she snapped again, I then held her down gently. Any suggestions on what to do?