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Thus, natural selection has favoured internal mechanisms that result in a skewed sex ratio because mothers that produce a daughter leave more offspring in the next generation than mothers who produce a son. In this species, more eggs are fertilised than eventually result in babies, so there is some mechanism by which a female embryo is preferentially kept and male embryos are reabsorbed early in pregnancy." He analysed data on the big brown bat to arrive at his conclusion. The study has been published in the journal PLos ONE.