I just noticed this morning that one of my hens has feather loss on both sides of her head. No blood. She is the only one and I have brought her in before it gets worse. I only have hens but I think it's because they hardly get outside in this brutal weather and the coop is not big. Do u think it is just bullying? I couldn't get a very good photo. It is going to be -7 celcius, 20 F today so I will try to get them outside and give the coop a cleaning.