Yes, that's one of the most evident differences even to newcomers...standard bred birds are BIG compared to hatchery/feed store birds. Of course there's alot more differences too but size is the first to meet the eye (-;Absolutely! I still have a few of my old hatchery girls, and up next to the good ones, they are TINY. Even my "Big Girl," the biggest hatchery hen, is smaller than the breeder birds.