The buff has the same markings, but with greenish-black on a golden-buff ground.
The silver is similar to the light, but has grey thighs and a dark breast with silver lacing.
The red has the same markings as the light, but the base colour is a rich dark red throughout.
The speckled is a rich dark mahogany colour, each feather with a white tip. The coronation Sussex has the same markings as the light, but with lavender instead of the black.
In species with short generation times, U is predicted to be far below 1, suggesting that sex is not maintained by its capacity to purge the genome of deleterious mutations.
Eight colours are recognised for both standard-sized and bantam fowl.
The eyes are red in the darker varieties but orange in the lighter ones. The earlobes are red and the legs and skin white in every variety.
Cocks weigh approximately The light Sussex has a white body with a black tail and black in the flight feathers and wing coverts; the neck hackles are white with black striping.
It has been suggested that sexual reproduction is maintained because it reduces the load imposed by recurrent deleterious mutations.
If rates of deleterious mutation per diploid genome per generation (U) exceed 1, and mutations interact synergistically, then sexuals can overcome their inherent twofold disadvantage.