Leucism. -Albinism.-
Xanthochroids
Leucism
Leucism is a very unusual condition whereby the pigmentation cells in an
animal or bird fail to develop properly. This can result in unusual white
patches appearing on the animal, or, more rarely, completely white creatures.
Albinism
Albinism is a different condition. The easiest way to tell the difference
between the two is that in albinism the eyes are usually pink or red, and
albinism affects the entire animal, not just patches.
This occasionaly causes very excited biologists to think they have discovered
a new species, when in fact leucism is the cause of the unusual markings
they have seen.
Xanthochroids
Xanthochroids Birds can show this condition in one of two ways: either there
is an excess of yellow in the plumage or the yellow replaces another colour
(in this instance the red). The condition has been reported in a number
of species, including other species of woodpecker (in North America), and
in many instances the colour replaced is red.
Quoted from
Wildlife
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