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Not as similar as thought: sexual dichromatism in Chimango Caracaras is expressed in the exposed skin but not in the plumage

Jose Hernan Sarasola, Auteur ; Juan Jose Negro, Auteur ; Marc Joseph Bechard, Auteur ; Agustin Lanusse, Auteur

Dans Journal of Ornithology (152(2) APR 2011)

Many of the mechanisms involved in visual signalling in birds are based on pigment-based plumage ornamentation and colouration rather than the expression of other, non-plumage-based displays. We have analysed the colouration of the tarsi and cer[...]

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