Data from: Melanin-based sexual dichromatism in the Western Palearctic avifauna implies darker males and lighter females

Juan J. Negro, Enrique Figueroa-Luque & Ismael Galván
Melanins are the most common pigments providing coloration in the plumage and bare skin of birds and other vertebrates. Numerous species are dichromatic in the adult or definitive plumage, but the direction of this type of sexual dichromatism (i.e., whether one sex tends to be darker than the other ones) has not been thoroughly investigated. Using color plates, we analysed the presence of melanin-based color patches in 666 species belonging to 69 families regularly breeding...
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