Hello there. I have 3 chickens, a year and 3 months old, all raised together (Americauna, Rhode Island Red, and Black Australorpe). There has never been an apparent pecking order. They have a large coop with a sheltered perch area 2 perches--but they all use the top perch), as well as a run, but spend most of their day free-ranging (eating my garden!). Their personalities are all very different, but I have never witnessed any of them assert dominance--they seemed like a happy family. Early this week I heard a ruckus in the evening in their coop, thought perhaps a raccoon had entered. The Americauna, Chirper, was attacking the Australorp, Chiquita (not just pecking her but biting/grabbing her wing feathers with her beak.) The Australorp was clearly upset; I let her out, she roamed a bit, re-entered and things seemed normal. The next day they all, seemingly equitably, roamed the yard. Well, tonight was a repeat--this time she pecked and took out some chest feathers. The Australorpe was really upset. The strange thing is that they are all still on the perch together. I assume this is pecking order stuff but am not sure why just now when it hasn't been a problem in the past, and, most importantly, what can I do about it? Advice would be much appreciated! Thank you.