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By heightening the demands of flight in wild male common crossbills (Loxia curvirostra), we explored the potential connection between red carotenoid-based ornamental plumage and flight metabolism. An Iberian winter population yielded 295 captured adult males using mist nets as the capture method. A controlled experiment involving half the bird population had their wing feathers clipped, thereby heightening the demands of their flight, the other half acting as the control group to eva