Lots of people, such as; Archeologists, Historians, and those who study the evolution of development of humans,etc. ask this question 'why have we started to walk on two feet', that question was never answered, and will never be answered with solid proof.
One theory about why we started to walk on two feet, is that there was a change in the African climate, and therefore forced Early humans to walk on 2 feet. A very long time ago, when the ancient peoples were in Africa, Africa was basically one huge forest. Over time, the huge forest became a high grassland. The Early Humans' prey they used to hunt started migrating because of their (Early Humans' prey) food sources, thus, the humans followed their prey. Because of all the walking the Early humans had to do (while following their prey), they figured it was much faster, requires less energy, and more efficient then going on all fours.
There are definitely many other great theories out there about why our earliest ancestors started walking on all four, such as; being able to carry more food, and therefore attract female. Sadly we will never find out why our ancestors started walking on 2 feet. I believe the theory that they followed their prey the most because it is most scientifically logical (from all the theories I've heard).
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