I have 3 chickens (2 cochins, 1 barred rock) born in April, kept in a backyard coop/run. They all appear healthy, are eating, drinking, pooping, growing well. About a month back I noticed the barred rock hen developed a very curved hind end, it turns towards her right. There are no signs of injury to the tail, wing, or leg and she is walking fine. No known injury and she is always secure and safe at night in her coop and in the run during the day. Doesn't bother her when I move her tail feathers around. Should I be worried? Any insight? Thank you!