I had to remove a sick hen (she is inside, condition critical) from the flock 4 days ago. Now the entire flock (23 remaining hens and 3 roos) is being really, really, nasty to one another. Two of them have lost about 50% of the feathers on the back of their necks and I have been witnessing severe chicken cruelty in regards to pecking. Could the removal of this hen have caused such a ruckus in the pecking order or is something else going on? We have had a very mild winter and so they are out freeranging every day so I don't think it is boredom or being cooped up that is doing it.