When I got my chocolates, what I had read said that most were just a bit too large to technically be called bantams, but I just checked the ABA, and Orpingtons are on the list. I didn't think they were a few years ago, but I'm not sure. I have had some that were much smaller than my bantam cochins. But some of mine bred larger offspring. So I'm not sure of the answer, just tossing out my thoughts.