Science When did human ancestors start walking on two legs? By Tanushree Jain - July 10, 2024 0 Share FacebookTwitterPinterestWhatsAppLinkedinReddItTelegramTumblrDiggFlipNaverEmailPrint Anthropologists have been arguing for 20 years about whether Sahelanthropus, a hominin that lived about 7 million years ago, was one of the first bipedal apes