Can a chicken be partially fibromelanistic, or is that like being partially pregnant? I have a 6 1/2 week old Araucana chick that has a black beak, black comb, black legs, black everything except it's skin and the center of the soles of it's feet which are yellow. He/she was hatched out of a mottled x black (split for mottling) pair. I have hatched 13 chicks from the pair and this is the only chick that hatched out all black. Is he/she considered fibromelanistic? Will he/she throw fibro chicks?