I was walking along our road this evening with my son, looking for fox grapes. From our coop I hear the egg song and I thought someone new had just laid her first egg. But though it was the egg song it was more frantic. My husband happened to be out by the coop so I asked him who was that. He said it was our two Australorps. They had spotted a hawk and were sounding the alarm. I don't know how in the world they could have seen it. They were in their run and they have a black shade cloth over it. My husband said the bird had a wingspan of about 16" to 18" and was pretty low. It had a whitish breast. I'm not sure what it could have been. The rest of the girls ran in the coop but the two Australorps stayed outside and kept calling. I'm pretty impressed by those two.