the world > health and disease > ill health > animal disease or disorder > disorders of animals generally > [noun] > abnormal pigmentation (6)
Zoology and Physiology. Darkness of colour in an animal resulting from a hereditary excess of melanin in the skin, fur, feathers, scales, etc. Cf…
Abnormal or excessive redness (in the plumage of birds or hair of mammals); a red variety (of some recognized species).