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Articles on Evolution

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Illustration of ritualised human sacrifice in traditional Hawaiian culture, as documented by the French explorer and artists Jaques Arago in 1819. Arago, Jacques. (1822). Promenade autour du monde: pendant les années 1817, 1818, 1819 et 1820, sur les corvettes du roi l’Uranie et la Physicienne, commandées par M. Freycinet

Why did early human societies practice violent human sacrifice?

Human sacrifice seems horrifying and costly. But there might be a reason so many early human societies practiced it.
A male African jacana bird mounts a female, but who takes the lead in caring for the young?. Shutterstock/Dave Montreuil

Wild sex: when sex roles get reversed, some females develop a ‘penis’

Sex roles in nature don’t always follow the same script. In fact, some females have genitals that resemble a penis. How can this be? Evolution has the answers.

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