in many species the males put on spectacular displays of chest-thumping, all-out aggression. It’s the rams that ram,
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, after all. But females have their own agendas,
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, and their competition with one another can be no less fierce. Female topi antelopes head-butt in fights over males much like rams do, and female chimps sometimes even kill each others’ newborns,
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But only after the sexual revolution of the 1970s did the phrase “competition among females” even begin to crop up with any regularity in books,
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, anthropologist Sarah Hrdy points out in the introduction to an October 28 special issue of Philosophical Transactions of the Royal Society B. Review papers in the rest of the issue examine how females compete,
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, and offer evolutionary explanations of behaviors ranging from maternal aggression in rodents to spreading rumors about sexual promiscuity by Homo sapiens,
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.
An article about the “mean girl” effect is the most unusual in a journal usually dedicated to every species but ours. “Human females have a particular proclivity for using indirect aggression,
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, which is typically directed at other females, especially attractive and sexually available females,
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,” writes

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