Xanthochromism

Unusual yellow pigmentation

Xanthochromism, from the Greek xanthos (ξανθός) "yellow" and chroma (χρώμα) "color", is an unusually yellow pigmentation in 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. A Cornell University survey of unusual-looking birds visiting feeders reported that 4% of such birds were described as xanthochromistic. The opposite of xanthochromism, a deficiency in or complete absence of yellow pigment, is known as axanthism.

This keyword could refer to multiple things. Here are some suggestions: