Continent-wide variation in feather colour of a migratory songbird in relation to body condition and moulting locality

American Redstart (Setophaga ruticilla) Science Article 7

abstract

Understanding the causes of variation in feather colour in free-living migratory birds has been challenging owing to our inability to track individuals during the moulting period when colours are acquired. Using stable-hydrogen isotopes to estimate moulting locality, we show that the carotenoid-based yellow

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