Data from: Are extra-pair males different from cuckolded males? An empirical and meta-analytic examination

Yu-Hsun Hsu, Julia Schroeder, Isabel Winney, Terry Burke & Shinichi Nakagawa
Traditional models for female extra-pair matings assume that females benefit indirectly from extra-pair mating behaviour. Under these so-called adaptive models, extra-pair males are hypothesized to have more compatible genotypes, larger body size, exaggerated ornaments or to be older than cuckolded males. Alternatively, (‘nonadaptive’) models that consider female extra-pair matings to be a by-product posit that female extra-pair mating can be maintained even if there is no benefit to females. This could happen if, for example,...
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