I have two 'Buff Orpington' pullets that I bought from feedstore back in March. I never took into consideration the foot color, and noticed a few months ago that one of them has a yellow beak, and yellow legs and feet instead of white. I would show you a pic, but Buff Orpingtons and Buff Rocks look almost identical. Both pullets look fully grown, and the one with the yellow is a tad bigger then the one with the white. Could she just not be purebred? Or do you think she got mixed with the Buff Orpingtons by accident and is probably a Buff Rock?