Why humans walk on two legs
Human bipedalism likely evolved in Africa's savannas, enabling energy-efficient long-distance travel that revolutionized our ancestors' survival and mobility.
Humans walk upright on two legs, a defining trait believed to have evolved for energy efficiency. Around 4 to 7 million years ago, early human ancestors adapted to open savannas in Africa. Walking upright allowed them to cover vast distances with less energy than knuckle-walking apes.
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