I have 6 hens who are 8 months old. The 2 Ameracaunas and 2 black sex links are both loosing feather on the backs of their necks for the past 5 days. It’s not bald to the skin. The quills are sticking out about one to two inches. I can’t find anything moving on them, like lice or mites. My 2 Rhode Island reds haven’t lost any feathers. I also have four 3-month old girls and they haven’t lost any feathers either. The 4 who are losing them are still acting normal, although I’m not out there a whole lot since it’s colder here now. I don’t really see any pecking going on (although I’m not out there a whole lot, but I can watch them from the house). We moved them into a new coup about a month ago, and introduced them to the younger chicks and integrated them, and that all went over fine. They have more than enough room in the coop, attached run, and attached fenced in area. We do not have a rooster. Pics I find of lice and mites seem like they lose the whole feather so they are bald, and pics I find of molting look more like what these 4 are going through. We noticed the Americaunas losing first, and a few days later the black sex links started losing. Just on their necks and a bit on the sides of their faces. I tried to get as good of pics as I could! Any ideas of what this could be from? I’m just not sure how to fix it because I don’t know if it’s lice, mites, molting, or feather pecking!