Ancient Ethiopian shakes the evolutionary tree

时间:2019-03-06 06:07:01166网络整理admin

By Claire Ainsworth A CHALLENGER for the title of oldest human ancestor has emerged from Ethiopia. The 5.8-million-year-old contender, which weighs in at around the same size as a modern chimpanzee, threatens to boot the reigning champion, Millennium Ancestor, down to the lower branches of the evolutionary tree. The dawn of humankind occurred 5 to 7 million years ago, when the ancestors of apes and humans went their separate evolutionary ways. But the fossil record of this split is scarce. Last year, scientists in Kenya announced they had found the earliest human-like animal, Orrorin tugenensis,