We have 5 hens and 1 cockerel. One of our hens (a speckeldy) just keeps pecking feathers out of the others and eating them. Even if she sees a feather on the ground she will immediately pick it up and eat it. She is pecking her fellow chickens bald. Can anyone please suggest how we can overcome this problem or do we just have to get rid of her? She appears to have taught this behaviour to one of the others as she pecks back but nowhere near to the same extreme.