Male crossbills grow redder feathers when they exercise harder

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The red feathers of male crossbills are brighter in birds that find it more physically challenging to fly, suggesting exercise influences plumage colour

Life



7 April 2022

Common Crossbill

Male common crossbill (Loxia curvirostra)

WILDLIFE GmbH / Alamy

In a kind of post-workout glow, male…

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