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What is the difference between

a self, foul and variegated Bird?

A self bird, such as in canary birds or society finches, is a bird in which the melanin pigments are present throughout the whole of plumage. The plumage don’t show light feathers anywhere. The breed of a self bird is normally the goal for a perfect exhibition bird. Specially in the category Melanin canaries is the selfs form an important requirement. A foul bird is called a bird that has some lightened feathers among the flight feathers of the wings orin the tails. There is no clear rule for the designation “some lightenend feathers”. There may be a number of one until four feathers or more, but no light feathers in other areas of plumage is allowed for this definition. In practice, a large number of light feathers in the wings and tail are nearly accompanied by areas of light feathering in other parts of the plumage. Then the name variegated bird  is given. A variegated bird (= factor piebald) shows in the plumage irregular parts of light and dark feathers.Variegated birds are divided in three categories: 1. lightly variegated birds with less than half (< 50%) of the plumage with dark coloured feathers (= more light than dark). 2. medium variegated birds with more than half of the plumage with dark coloured feathers (= more dark than light). 3. heavily variegated or also called three- parts dark birds with more than 3/4 of the plumage with dark coloured feathers (> 75 % dark). A bird without variegation at all is called a clear bird (e.g. a lipochrome canary).