I have 6 SS (3 young) and one Wellsummer (5 yrs old) and 2 Australorps (both 5 months old). The Welsummer is usually quite timid about everything. Today the Welsummer had one of Australorps pinned on the ground and was pecking her head. Two other times in the past few weeks an Austalorp (same one?) was pinned to the ground and several hens (adults and younger ones) were all on top of her -one SS flapping around like a rooster would be-and attacking her. Of course I don't know if it's the same bird being attacked, but it seems odd that they are this aggressive. In the past I've had hens peck and chase each other but have not seen this behavior where they pin down another hen, if that's what they did. It's possible she is taking a defensive position because I've never seen how this starts-and clearly it's happening when I'm not there. Has anyone else seen this behavior? Is there a way to mark a chicken so I know if it's the same one getting attacked?