Just noticed this... what is it and how do I treat it? About the chicken: 1 year old RIR Never weighed her, my guess is 8-10 lbs, same size as the others hatched the same day Lays fine, 5-6 a week Exhibited this today No noticeable change in behavior, eat, or drinking She free ranges all day... the others seem fine. There have been some squabbles lately with 2 new pullets getting worked into the flock over the past month or so. (They've been around one another for months so no truly new members of the flock.) I've not done anything to remedy it at this point, would prefer taking care of it at home vs. a vet trip.