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A. Peters, A. G. Denk, K. Delhey and B. Kempenaers Carotenoid-based bill colour as an indicator of immunocompetence and sperm performance in male mallards Journal of Evolutionary Biology 17

Article first published online: 13 MAY 2004 | DOI: 10.1111/j.1420-9101.2004.00743.x

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