FILE PHOTO: Examples of an Oldowan percussive tool, core and flakes dating from roughly 2.9 million years ago and found at the Nyayanga site in Kenya are seen in this undated handout image. (Top row) Percussive tool found in 2016. (Second row from top) Oldowan core found in 2017. (Bottom rows) Oldowan flakes found in 2016 and 2017. The analysis of wear patterns on 30 of the stone tools found at the site showed that they had been used to cut, scrape and pound both animals and plants. T.W. Plummer, J.S. Oliver, and E. M. Finestone, Homa Peninsula Paleoanthropology Project/Handout via REUTERS