It is more difficult to get the color larger but it's possible with selective breeding. The Golds can get bigger by simply adding in a JUmbo Brown. In other colors you would either have to bring in a Brown or white...but then you can get tuxedos....some people don't like the tuxedos so then you have to breed that out. The browns bred in would be better to up the size. I sell the colors as standard size but some people have hatched out bigger birds from them.