I have a mystery on my hands. I just hatched a RIR egg and a black chick with black on its legs and a white spot on its head. I got the eggs from my dad. This is the second time I hatched his eggs and got a black mystery chick out of both of the hatches. I know his RIRs are purebred because they came from a hatchery in Wisconsin. He has hatched these eggs before and has never gotten any black chicks. Could the RIR have a gene that produces a black RIR? He does not have any other chickens that are black. Any help would be appreciated. I will try to get a picture of it tomorrow and put on here to see if anyone can tell me what it is.