Hi guys! I'm wondering if y'all could help. I have 9 male khaki Campbell ducks in with my chickens. I got them for free from a woman who had them in a small puppy playpen in her backyard. They had full feathers when I got them months ago, but recently I've noticed the feathers around their eyes, head, and back of the neck is balding. The chickens usually don't bother them and everyone gets along fine. What could it be? I thought lice but the chickens are all fine. I will try to get some photos later. Thanks!