We've always had a few Australorps in our flock for their steady laying, communal personality and beautiful colors. Never had a problem with them until one ended up as the top of the pecking order and let it go to her head... we tried to give her time to settle down, but the abuse of the other girls just got to be too much and we had to rehome her. The other Australorp we have is just fine, so it may have just been that particular bird. I wouldn't say they are the most docile of breeds and wouldn't necessarily consider them a "must have" in our flock moving forward, but at least the one we still have now is still producing well and behaving like a good girl.