1st instance of microevolution in early human relative discovered

The recently discovered skull of an ancient human relative reveals that the species underwent dramatic changes in a short period of time, a phenomenon known as microevolution, a new study finds. 

Previously, males of Paranthropus robustus, an extinct australopithecine species (relatives of Lucy), were thought to be substantially larger than females. This dichotomy is well known among some modern-day primates, including gorillas, orangutans and baboons. However, a new fossil unearthed in South Africa indicates that differences attributed to sex are actually due to microevolution, as the species rapidly evolved during a turbulent period of local climate change about 2 million years ago.

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