I noticed this morning that at least 3 of my 5 hens are missing feathers in their rears. There are no feathers laying around in their coop or run, is it possible they are being pecked? I haven't noticed any messy poop, mites, or other signs of infection. I don't think they are molting as it usually starts on their heads right?? I am worried now with the frigid temps we have been having in NY that their exposed areas will get frostbite. Anyone have any insight? Thank you. Sorry I didn't get a chance to take pictures and post them this morning.