WASHINGTON (Reuters) -Bipedal locomotion - walking upright on two legs - is a fundamental trait underpinning humankind's success. Scientists now have identified two innovations that occurred long ago ...

It's hard to tell when—and why—our ancestors got down from trees and started walking on two legs. Many early hominins capable of bipedal walking were also well-adapted for climbing, and we lack fossil ...

Here’s what you’ll learn when you read this story: One longstanding theory of human bipedalism is that it first developed in our ancient hominid ancestors as a way to more easily move around the ...

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