This (11 wk old) cockerel is from a Jubilee Orpington rooster and a (maybe? mix?) black wynadotte/Orpington hen (last pic, she carries the mottling gene and has produced some black with white mottling chicks). He was very slow to feather, and his feathers are as iridescent as they look in the pics. The yellow showed up recently and we are very surprised. What caused this yellow patterning? What would I call his coloring and pattern? and does this give any hint as to the hen's genetics? Chicken experts and afficionados, can you give me the terms to describe this guy? And do you think his feathers are pretty?