Easy to tell...Orp babies have flesh colored legs and feet. Rocks have yellow legs and feet. The hatchery Orps are never as large, or fluffy, as Buff Orps bred to the Standard of Perfection and sold by breeders who show.hi, i know this is an old post, but i read it and wondered if this was a common problem. i am getting my first chicks in a couple of weeks and aubuchon hardware is selling buff orpingtons. how can i tell if they are actually buff orps or buff rocks? i want orps. thanks so much