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  • Eggshell pigmentation in the blue tit: male quality matters 

    Badás, EP; Martínez, J; Rivero-de Aguilar, J; Stevens, M; van der Velde, M; Komdeur, J; Merino, S (Springer Verlag, 2017-03-02)
    Many passerines lay protoporphyrin-pigmented eggs, and the degree of spotting seems to be related to female condition and environmental characteristics. However, most studies have ignored the relationship between the male’s ...