What determines the vibrant red plumage of the male Vermilion Flycatcher?

Answer

The metabolization of yellow carotenoid pigments like zeaxanthin obtained through diet

The brilliant red coloration is a costly biological signal that serves to indicate the health and foraging capabilities of the male. This pigmentation is directly derived from the intake of specific dietary elements known as yellow carotenoid pigments, specifically zeaxanthin. Because the production of this color is dependent on obtaining the right nutrients, a male with peak coloration demonstrates superior ability to find food and high genetic fitness to potential mates. If these birds are kept in captivity and their natural diet is not replicated, they lose this distinct vermilion appearance, confirming the link between their food sources and their outward display.

What determines the vibrant red plumage of the male Vermilion Flycatcher?

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