We thought that walking on all fours like a gorilla is more primitive than walking on two legs as humans do. But new fossils suggest even very ancient apes walked upright
Source:
https://www.newscientist.com/article/2217300-mystery-of-why-humans-walk-upright-may-be-explained-by-surprise-fossil/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home