Thank you SO much for the information , I think mine might be on the eight week plan. Poor guy has been going for about 5 weeks and every day there are more and more. All over his face , head , neck and body. Like you say tail feathers , wing feathers. He’s a mess. I hope it ends soon as I can see how uncomfortable it makes him. . I help with the head and neck. Thanks for the great info!! Hopefully it will all be over soon and he will be his sweet little self again! . Stay safe !!