Our ancestors may have started to walk upright to increase the amount of food they were able to carry.
Anthropologists made a similar observation when studying chimpanzees, noting that the animals would sometimes walk upright to help free their hands when they needed to carry something valuable. If early humans learned to walk upright in this same manner it would have likely boosted their odds of survival by improving their food carrying capacity.
"The team from the University of Cambridge and Kyoto University in Japan believe the benefit of "first come, first served" and getting a bigger share of scarce food supplies could, over a long period of time, have led some of our earliest "hominin" ancestors to evolve into "bipedal" primates walking on two legs permanently instead of four."
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