She Was Half Ape, Half Human-and She May Hold the Secret to What Makes Us Who We Are

Key Points:

• A 4.4-million-year-old female skeleton named Ardi, belonging to the species Ardipithecus ramidus, provides new insights into when human ancestors first began walking upright, predating the famous Lucy by a million years.
• Discovered in Ethiopia in 1994, Ardi shows a combination of primitive and modern traits, including a grasping big toe alongside foot, pelvis, and cranial features adapted for bipedalism.
• Research led by Thomas Prang indicates that Ardi's ankle bone (talus) reflects adaptations for both climbing and walking upright, challenging models that humans evolved from a generalized arboreal ape ancestor.
• The study suggests humans evolved from an African ape-like ancestor with specialized locomotion abilities rather than from an ancestor lacking adaptations for terrestrial movement and climbing.
• Ardi's foot morphology shows a transition from tree-climbing to bipedal walking, highlighting how early hominins developed feet better suited for supporting body weight on the ground.