I was given 8 chicks that my neighbor ordered from MPC. He ordered 2 each of BO, JG, Aust, and BR. I have been told the two standard BO's are actually bantam Buff Brahmas. I think they got the Barred Rocks right, but I cant tell much difference between the four black birds. The biggest difference I see is that two of them show white under the tips of their feathers when in flight. The white at the tip of feathers. I love these chicks. The black and white looks so cool.