We had some black roosters a few years ago that we got in an assortment from our local feed mill. I'm assuming that they were black australorps, but like i said they came in an assortment of various breeds, so its possible that they could have been something else. They were very aggressive and fought almost all the time, however they never attacked people or fought with each other, but would tag team the other roosters. I especially remember them ganging up on the big bb white turkey we had. Everything i have read about this breed suggests that the roosters are among the most peaceable that you can get. Has anyone else had this problem with black australorps?