We have 11 Barred Plymouth Rocks and we can tell which are the pullets and which are the cockerels. We think! What we don't know is what we have in the picture. This little guy/gal was much lighter since we got her (I'm hoping it's Macy Gray rather than Gandolph the Gray!) and much bigger. Has continued to be much bigger than it's flock mates and isn't getting the typical barred markings. We got all the chicks from the University of Alberta's chicken program and we've looked at the other heritage breeds they are raising/selling and don't see any like Macy Gray. Could it be that we have an albino Barred Rock? This doesn't explain the discrepancy in the size differences though. Any ideas?