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This illustration provided by the University of Poitiers in August 2022 shows different modes of movement practiced by Sahelanthropus tchadensis. Based on arm and leg fossils, scientists concluded that Sahelanthropus, an ancient hominin species from Chad, walked upright - which would add evidence that it’s the earliest human ancestor dug up so far, according to a study published on Wednesday, Aug. 24, 2022, in the journal Nature. (Sabine Riffaut, Guillaume Daver, Franck Guy/PALEVOPRIM/CNRS - Universite de Poitiers via AP)

This illustration provided by the University of Poitiers in August 2022 shows different modes of movement practiced by Sahelanthropus tchadensis. Based on arm and leg fossils, scientists concluded that Sahelanthropus, an ancient hominin species from Chad, walked upright - which would add evidence that it’s the earliest human ancestor dug up so far, according to a study published on Wednesday, Aug. 24, 2022, in the journal Nature. (Sabine Riffaut, Guillaume Daver, Franck Guy/PALEVOPRIM/CNRS - Universite de Poitiers via AP)

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