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Many birds use carotenoids to colour their plumage yellow to red. Because birds cannot synthesise carotenoids, they need to obtain these pigments from food, although some species metabolise dietary carotenoids (which are often yellow) into derived carotenoids (often red).
Here, we study the occurrence of yellow and red carotenoid‐based plumage colours in the passerines, the largest bird radiation...
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