Hi there, We inherited 12 chickens when we moved a while back. The chickens pecked each other then and the previous owners were divided on whether it was due to mites or rudeness. Over the last couple months, there are 2 or 3 chickens that have grown in full feathers with no sign of pecking. The other day as I was taking care of the birds, I noticed one looked funny and realized that it's tail was completely gone. Another has it's tail mostly gone. I observed and noticed one of the full feathered birds pecking at these two. I'm wondering what we should do. A couple possibly pertinent pieces of information.... They have plenty of space to run. We had a couple cold days where they spent more time in the coop and it was a bit after this I noticed the missing tails. There is fresh poop behind the nesting boxes, like the picked on ones are roosting back there for protection. Any advice?