We have a very docile hen. She is always up for holding, petting and carrying around. Our granddaughter adopted her as her own. Today, I was petting her and when I was done I stood up. A rooster came over and grabbed hold of her neck and wouldnt let go. She screamed and screamed. I watched this rooster for the rest of the day. I noticed that he and another rooster were displaying behavior like that all day. I have decided to call them the bully brothers. Is this normal? Do roosters hang out together? The other ones dont do this. We have around 14 or 15 roosters. Do they single out hens to pick on? there does not seem to be any rhyme or reason to the attacks. They are all 3 1/2 months old. All chickens are Buff Orpingtons.