I just introduced 12 - 12 week old chicks to a coop with 2 older hens. They have been in there since noon yesterday and this evening I found that one of the chicks has been pecked on her back near her tail feathers and a few tail feathers pretty bad. She was bleeding. I put here into a kennel inside of the coop with her own food and water to give her a break. What can I do? I watched a while and it looks like the chicks are pecking her... not the older hens. Any suggestions? I want to protect her and keep the peace in the coop.