Albinism
Lack of pigment on the body, so that a full albino has white feathers and pink eyes. A partially albinistic bird, with white patches in its plumage, is said to be 'leucistic', although this term is also used to describe very pale individuals which might also be called 'dilute albinos'. Those birds which are normally white are not albinos, and do not have pink eyes, albinism being an aberrant condition.From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver