Why Did Upright Walking Evolve?

According to this theory, the energy saved by walking upright gave our ancient ancestors an evolutionary advantage over other apes by reducing the costs of foraging for food. The idea is just one of many scientists have entertained as reasons for why humans walk on two legs.

Why did we start walking upright?

(Four to seven million years ago, humans and chimpanzees diverged from a common ancestor. They then developed independently.) ... As a group, the humans used 75 percent less energy walking upright than the chimps used walking on all fours. Essentially, walking upright seemed to be beneficial because it saved energy.

Why did humans evolve to stand on 2 legs?

A team of anthropologists that studied chimpanzees trained to use treadmills has gathered new evidence suggesting that our earliest apelike ancestors started walking on two legs because it required less energy than getting around on all fours. ...