We have this one little duck, she is a few months old, her name is Pistachio. When I hold her, sometimes she'll lower her head, make this small huffing sound and bite and pull my lip. She has made my lip bleed before. Why does she do this? What am I doing wrong? I've had her since a hatchling and she used to cuddle and follow me around, now she's big enough to be with our other 3 in the coop. Is she being territorial or does she just hate me?