We have 12 hens and 1 rooster. I have noticed in the last few days that 3 of the hens have very sparse feathers on their necks and some of their tail feathers have been pulled out! One chicken looks like one of her eyes has been injured. I am suspecting the rooster because he is ornery. I haven't seen him doing it but I wonder if he picks on them when they are in the coop? Anyway we have separated him and locked him in a shed. I am seriously considering getting rid of him! They are my girls and I don't need him at all if he acts like that. Unless someone has some other idea of how their feathers are coming out, he is history!