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Ardi's a Hominin—But How Did She Move?

Science  26 Apr 2013:
Vol. 340, Issue 6131, pp. 427
DOI: 10.1126/science.340.6131.427

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Summary

Researchers gave Ardi, the oldest and most complete skeleton of a potential human ancestor, new recognition as a hominin. They agreed with the discoverers that Ardi walked upright—albeit in a weird way—and that features in her teeth and skull make her a primitive member of the human family. But debate raged about whether she also climbed vertically in trees like an ape.