My sister in law has 7 chickens...4 buff's and 3 americaunas. They have all been getting along for the last year + but all of a sudden they are starting to bully other chickens. They pecked the comb of one so bad she had to put the one chicken in a dog kennel at night so they wouldnt bully her. Then today she woke up and went to let them out and they got to another one so bad her whole neck and face is bloody. Not sure what could be causing this all of a sudden aggression...The only thing different is that they went from having an enclosed run to having free range of the yard...except now they are not getting out of the coop as much because of the run being gone...They spend most of the time outside, but just a few days here and there it is not safe to let them out...any help or advise would be great!