Hi all, I have 6 hens and last month noticed one of them had a bunch of feathers broken off near the skin on the back of her neck. I do have a rooster but this hen doesn't let him mate with her. Even if she did, none of my other hens have any broken feathers. (He's quite a gentleman.) I've been searching online and have read about mites but I haven't seen any on her and have checked her in other places for them. At first I thought maybe a dog or other predator had gotten a hold of her but she got away. But today checking her again there are even more broken around the sides of her neck now. I don't see any signs of molting in her and there are no pin feathers in that area. Here is a pic. Any thoughts?