I'm hoping someone can enlighten me. I have 36 chickens that are about 9 months old. They are a mix of breeds. 5 of my girls that are barred rock hens are hurting me. If I pick up another chicken (any breed) they immediately come over and start pecking at my legs. And hard!! Even through my jeans they are leaving bruises on my legs. Are they just jealous or is this a trait of the breed?