Most Complete Homo habilis Skeleton Ever Found in Kenya Reveals Early Ancestors Retained Tree-Climbing Adaptations Over 2 Million Years Ago!

In a major discovery published in Nature (May 2026), researchers have announced the most complete Homo habilis skeleton yet recovered — a partial individual (KNM-ER 64000) from the Koobi Fora region of northern Kenya, dated to approximately 2.1 million years ago. The specimen includes a nearly complete skull, both hands, feet, a partial rib cage, and significant portions of the upper and lower limbs — far surpᴀssing the fragmentary nature of previous finds such as OH 7 and OH 62.

The postcranial skeleton displays a striking mosaic of traits. While the pelvis and lower limbs confirm habitual bipedalism, the hands feature strongly curved phalanges, powerful flexor muscle attachments, and a robust thumb suited for powerful gripping. The shoulder girdle retains a high scapular position and glenoid orientation optimized for overhead arm use — adaptations classically ᴀssociated with arboreal locomotion in earlier australopiths. CT scans of the hand bones further reveal internal trabecular patterns consistent with frequent climbing and suspension.

Lead author Dr. Louise Leakey (Turkana Basin Insтιтute) states: “This is the first time we can see the full locomotor repertoire of Homo habilis. It was clearly still spending significant time in the trees even as it walked upright on the ground.” Co-author Dr. John Kappelman adds that the skeleton shows “a body built for both worlds — bipedal on the savanna floor, yet fully capable of escaping predators or foraging in the canopy.”

The find pushes back the timeline for the loss of arboreal adaptations in the Homo lineage and demonstrates that early tool-making humans remained versatile climbers for hundreds of thousands of years. It also reinforces the emerging view that human evolution was not a simple linear march toward terrestrial life but a complex, mosaic process involving prolonged retention of ancestral climbing abilities.

As further analysis of the skeleton proceeds, KNM-ER 64000 promises to reshape our understanding of how the first members of our genus navigated a changing East African landscape more than two million years ago.