an evening grosbeak with overly yellow coloration – possibly xanthochromism, which is an overproduction of yellow pigment.
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Tag: xanthochromism
what is xanthochromism?
xanthochromism is an unusually yellow pigmentation in an animal that isn’t normally that color. it can be diet-related, but is usually caused by a genetic mutation that results in underproduction of other pigments, which are replaced by the yellow pigment. xanthochromism is relatively common in birds and reptiles – in the pet trade, we often call animals bred for these traits ‘lutino’.
source: (x)
today's bird 