
1) Bird colour
Found on
https://www.crosswordclues.com/clue/leucism

Leucism əm is a condition in animals characterized by reduced pigmentation. Unlike albinism, it is caused by a reduction in all types of skin pigment, not just melanin. ==Details== Leucism (occasionally spelled leukism) is a general term for the phenotype resulting from defects in pigment cell differentiation and/or migration from the neural cres...
Found on
http://en.wikipedia.org/wiki/Leucism

A genetetic aberration where the animal is devoid of pattern and of color, often making it appear to be snow white.
Found on
http://www.coastalplainsreptiles.com/glossary.htm

Condition of plumage resulting from reduced pigment in feathers; leucistic birds vary from having a few stray whitish feathers to being nearly all white with just a trace of normal pigmentation (the latter resembling albino birds but with normally pigmented eyes).
Found on
http://www.encyclo.co.uk/local/22218

Whiteness of feathers, but does not have red eyes, caused by reduced pigmentation in the bird's feathers by recessive allele.
Found on
https://www.birds-of-north-america.net/Bird_Terminology.html

Failure to express the normal feather colouring pigments resulting in areas of white plumage to a greater or lesser extent but not affecting other body parts, e.g. skin and eye colour; distinct from albinism which invariably effects the entire plumage as well as skin, eye colour, etc.
Found on
https://www.encyclo.co.uk/local/22222
No exact match found.