xanthochromism

Xanthochromism is an unusually yellow pigment for an animal. It is often associated with the lack of usual red pigmentation and its replacement with yellow. The cause is usually genetic but may also be related to the animal's diet. It is notably present in birds, with birds with this mutation being referred to as "lutino" and making for popular pets.

https://en.wikipedia.org/wiki/Xanthochromism

See also

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