I think that I've read orpingtons take almost a year to be full size. Mine are orpingtons. They look just like all the pictures I've seen. Now that they are maturing their temperments are a bit friendlier. I think it's just the competition. So I've increased the feed more and I'm catching an Orpington and feeding them alone. I try to rotate it and specifically try to grab the ones with thin boney chests.