Did a nine-year-old boy discover the missing link in human evolution?

Nature · Published 3 October 2026 Swipe more like this →

In short: In 2008, a young boy exploring a South African cave stumbled upon a fossilized collarbone that would ignite a fierce scientific debate. Australopithecus sediba, a species dating back nearly two million years, possesses a baffling mix of primitive and modern traits that challenge our understanding of how humans evolved.

Discovered by Matthew Berger in the Malapa Cave system, the remains of Australopithecus sediba—specifically the juvenile MH1 and adult MH2—offered a rare, well-preserved look at a hominin that seems to sit between the primitive Australopithecus and the more advanced genus Homo. The species, whose name means fountain or wellspring in Sesotho, lived approximately 1.977 million years ago. Its discovery was hailed as a potential turning point in paleoanthropology because it provided a unique anatomical mosaic that defied simple classification.

The physical evidence is contradictory. The species possessed a small braincase similar to other australopiths, yet it displayed a shift toward a more humanlike frontal lobe. Its pelvis, while retaining some australopithecine features, showed modern, Homo-like characteristics, such as vertically oriented iliac blades. This has led some researchers to argue that the evolution of the human pelvis was driven by the requirements of bipedal locomotion rather than the need to accommodate larger-brained offspring. Meanwhile, the hand and foot structure suggest a creature that was both bipedal and capable of efficient tree climbing.

The scientific community remains deeply divided over the species' place in our family tree. While some researchers believe A. sediba is a direct ancestor of Homo, others argue it may be a chronospecies of A. africanus—a late-surviving population that evolved over time rather than a distinct new lineage. Some critics even suggest that the 'modern' features observed in the juvenile specimen might simply be developmental traits that would have disappeared in adulthood. Whether A. sediba is a vital ancestor or an evolutionary dead end, it forces a re-evaluation of the timing and drivers of human development.

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