So I bought a pair of Barred Rock Pullets, Buff Orpington Pullets, and Black Australorps. My questions has to do with the last pair. One of the Black Australorps has white markings on the end of her mature wing feathers. I was under the impression that this breed was ALL black. The other Black Australorp's mature feathers are all black and the only other yellow is around her face from her baby feathers. She is the 4th one back in the picture. 1st is a Buff Orpington, 2nd is a Barred Rock, 3rd one back is another Buff Orpington, and the 4th one back is her (the other one on the right in the back is another Barred Rock. Is this just not a pure bread Black Australorp or is it another breed?