My hens are all between 7-10 months old and 3 of them have started losing their neck feathers and some below their tail feathers in the last few days. They're in a house that has a heater so it keeps it at least 0 when it's -25 outside, but I'm worried about them losing feathers at the worst possible time (record cold temps in Chicago). I've moved the 3 to a small indoor pen I have which is warmer (40), but am I just being paranoid? And how do I tell the difference between molting and fighting? This is my first winter with this many birds (50) and they don't seem to fight, but I can't be sure they don't. Also, there are 6 guineas in the flock (that chase them first thing in the morning, but don't attack them) and no roosters. What do you think??