I have about 40-50 chickens in the yard. I have two mature RIR roosters and about 12 RIR hens. The roosters are also crossing with BR, Leghorn and Americana hens which makes up the rest of the flock. So far in our incubator we have had what seems to be 2 RIR chicks come out yellow in color. We have also had two hatch that were straight black. These would have came off the barred rock hens cause the eggs were brown. With them being crossed with RIR what would they be considered? Yardbirds? Someone told me sexlinks or just mutts.