Sahelanthropus is thought to have been bipedal based on the positioning of its:

Question

Quizplus · Accepted Answer

The position of the foramen magnum, or the hole in the skull where the spinal cord enters, is a strong indicator of whether an organism is bipedal or quadrupedal. In Sahelanthropus, the foramen magnum is positioned directly underneath the skull, indicating bipedalism. The positioning of the pelvis and thoracic vertebrae can also provide information on bipedalism, but the foramen magnum is a stronger indicator. The metatarsals are bones in the foot and would not provide information on bipedalism in the skull.

Sahelanthropus Is Thought to Have Been Bipedal Based on the Positioning