Barred buttonquail males outlive females

Stefan Leitner, Roswitha Brighton & Cornelia Voigt
Sex differences in lifespan can vary considerably across species. Variance in lifespan depends on the progression of the mortality rate with age. Males are usually thought to have a shorter lifespan than females, which can be explained by sexual selection acting on secondary sexual traits that affect longevity. Such a bias in mortality between the sexes is also an indicator of the adult sex ratio. While there is evidence for this relationship from species with...
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