I'm curious how you all know it's an Australorp. We got a brown layer assortment from McMurray and got four black chicks. We had ordered two Australorps specifically (outside of the assortment) so we know that two of them are for sure, but as far as I can see the others could just as easily be Black Giants, Barred Rocks, Black Stars or even White Giants (until their feathers start coming in, of course). But with the chicks it's hard to tell. Really curious!