I bought them from someone on CL. They were really just selling them as eating eggs, but I wanted to hatch them. I would asume they are hatchery stock.Where did your RIR eggs come from? Most yellow chicks are white as adults. If they are from a hatchery RIR bred to a hatchery RIR or other hatchery bird, it could easily end up white since most hatchery birds have some cross breeding in their background. Those hidden genes are just looking for a way to express themselves. Looking on the bright side, if it is a pullet, it will more than likely lay lots of eggs for you!