article_snippet: This was a crucial moment in human evolution from primates as This created the dry open habitats that led our ape-like ancestors to walk upright for the first time.
article_snippet: - Primates started to walk upright.'
article_snippet: Estimates for exactly when human ancestors began walking on two feet instead of four are varied and controversial.
article_snippet: Some claim that a six-million-year-old species called Sahelanthropus was the first to become bipedal while others point to the four-million-year-old Australopithecus anamensis.
article_snippet: However, the latest study has now provided clues as to when the landscape in the part of Africa where these ancestors are thought to have taken these ancestors first bipedal steps began to change.
highlights_snippet: Researchers say led the primates living there to evolve bipedal walking .