Yesterday everyone was fine-my husband put the flock to bed and he didn't notice anything wrong. This morning my light brahma chicken- who I believe is actually a rooster- had a chewed up tail. He's only 4 months old so still had a little hen tail except the top two feathers were starting to grow longer and curl (which is why I'm guessing she is a HE). I have 2 other hens and 3 ducks. Everyone seems normal/fine. Is this a normal occurance? Is there a disease/parasite/??? That would cause this? I am familiar with parrots and feather picking-i haven't noticed that behavior in anyone but maybe I don't know what to look for in chickens. Any idea? Suggestions? Thoughts?