50 years ago, evidence showed that an extinct human ancestor walked upright
Excerpt from the February 16, 1974 issue of Science News
![Illustration of Sahelanthropus tchadensis walking upright on the ground and climbing in trees](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2024/02/021024_50YA_feat.jpg?fit=1030%2C580&ssl=1)
Leg and arm bones unearthed in Chad in 2001 hint that the extinct human ancestor Sahelanthropus tchadensis (illustrated) walked upright on the ground and in trees some 7 million years ago.
© Sabine Riffaut, Guillaume Daver, Franck Guy/Palevoprim/CNRS/Université de Poitiers