Immature birds have duller and less demarcated plumage. This results in the complete lack of colouration in their plumage and blue-grey eye colour. The rest of the plumage is a rufous chestnut. There is a further moult into breeding plumage in winter in Africa. When selecting for mates, ultraviolet plumage and skin coloration show a high level of selection. Black swans are large birds with mostly black plumage and red bills. Most of the plumage is pinkish white. Occasionally, peafowl appear with white plumage. The juveniles have brown longitudinal striped plumage. The Indian peahen has a mixture of dull grey, brown, and green in her plumage. The female has unbarred maroon brown plumage. These rails are mostly brown and black with some white markings in plumage colour. Second-year birds lag behind full adults in developing breeding plumage. Distinguishing females of the three subspecies using plumage features is not usually possible. The ornate plumage of peacocks, as used in the courting display, attracts peahens.