Fossil hunters discovered remains of a 6-million-year-old human ancestor, dubbed Orrorin tugenensis, at a Kenyan site in 2000. Their analysis of upper-leg fossils from Orrorin suggested that it walked upright in a surprisingly modern way, more like 2-million-year-old Homo erectus than the 3- to 4-million-year-old australopithecines, the group that includes the partial skeleton known as Lucy.
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