Leucism
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Leucism is a wide variety of conditions that result in partial loss of pigmentation in an animal—causing white, pale, or patchy coloration of the skin, hair, feathers, scales, or cuticles, but not the eyes. It is occasionally spelled leukism. Some genetic conditions that result in a "leucistic" appearance include piebaldism, Waardenburg syndrome, vitiligo, Chédiak–Higashi syndrome, flavism, isabellinism, xanthochromism, axanthism, amelanism, and melanophilin mutations. Pale patches of skin, feathers, or fur can also result from injury.
Leucistic white lions owe their colouring to a recessive allele. Note the eyes and lips remain the normal colour. Studies have shown that the reduced pigment comes from a mutation in the gene for tyrosinase, the same as causes Type I oculocutaneous albinism in humans.
This white horse owes its coloring to a dominant allele (dominant white).
A leucistic rock dove. Both the eyes and legs are still of the normal colour.
Leucistic Texas rat snake (Pantherophis obsoletus)
Indian peafowl
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The Indian peafowl, also known as the common peafowl, and blue peafowl, is a peafowl species native to the Indian subcontinent. It has been introduced to many other countries. Male peafowl are referred to as peacocks, and female peafowl are referred to as peahens, although both sexes are often referred to colloquially as a "peacock".
Image: Peacock, East Park, Hull panoramio
Image: Pavo cristatus Tierpark Hagenbeck, Hamburg, Germany female 8a (1)
Male neck detail
Black-shouldered Indian Peafowl Pavo cristatus from private collection of Coenraad Jacob Temminck (1778–1858), held at Naturalis Biodiversity Center, Leiden, the Netherlands.