My smallest chicken, our buff orpington has a patch of frozen feathers on her back. It was -10° here last night. Our chickens are about 10 months old and all their combs and feet look good. I am just wondering about those few frozen feathers. Do I need to do anything for that? I have kept them inside the coop yesterday and today so they wouldn't get wet from the blowing snow and since the wind chills were 30° below zero.