Scientists have a mystery on their hands after the discovery of 330 stone tools about 2.9 million years old at a site in Kenya, along Lake Victoria's shores, that were used to butcher animals, including hippos, and pound plant material for food.
Scientists had long believed Oldowan tools were the purview of species belonging to the genus Homo, a grouping that includes our species and our closest relatives. But no Homo fossils were found at Nyayanga. Instead, two teeth - stout molars - of a genus called Paranthropus were discovered there, an indication this prehistoric cousin of ours may have been the maker.
Other hominins existing at the time included the genus Australopithecus, known for the famous even-older fossil "Lucy." The Nyayanga site today is a gully on Homa Mountain's western flank along Lake Victoria in southwestern Kenya. When the tools were made, it was woodland and grassland along a stream, teeming with animals.
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