A new analysis of the 3.4-million-year-old ‘Burtele Foot’ fossils from Ethiopia shows multiple human ancestor species living side by side, fundamentally changing what we know about our evolutionary path.
The Discovery That Upended Human Origins
In 2009, scientists unearthed eight partial hominin foot bones, now famously called the Burtele Foot, in the Afar Rift region of Ethiopia. These fossils, dating back 3.4 million years, baffled experts: they showed an ancient being who walked upright but retained an opposable big toe—a rare combination hinting at both ground and tree life [Reuters].
The true identity of this ancient hominin remained a mystery for over a decade. A recent breakthrough came with the discovery of 25 teeth and the jawbone of a young child nearby, letting researchers confidently link the foot to Australopithecus deyiremeda, a separate species from the more famous Australopithecus afarensis—Lucy’s kind. The significance of this finding is profound: these two closely related but distinct human ancestors lived side by side.
Multiple Human Ancestors: Evolution’s Messy Experiment
The dominant story of human evolution for decades emphasized a linear progression: one clever ancestor evolving into the next. The Burtele Foot refutes this view. Instead, science now shows a “bushy” evolutionary tree, with multiple hominins experimenting in locomotion, habitat, and diet at the same time and place [Reuters].
- Australopithecus deyiremeda—with its opposable big toe—combined tree-climbing abilities with bipedal walking. It likely pushed off from its second toe rather than the big toe, an adaptation not seen in modern humans or Lucy’s species.
- Australopithecus afarensis—including Lucy—lacked the opposable toe, showing strides closer to ours and a more varied diet.
This coexistence, shown clearly in the fossil record, demonstrates that early hominins did not follow a straight evolutionary path. Instead, they diversified, competed, and adapted in surprising ways.
What the Fossils Reveal About Our Ancestors’ Lives
Paleoanthropologist Yohannes Haile-Selassie described the findings as the most conclusive evidence yet that more than one human ancestor species lived between 3.5 and 3.3 million years ago. This period, long before Homo sapiens emerged, was marked by a range of evolutionary experiments.
Key revelations from the new research include:
- Australopithecus deyiremeda’s foot anatomy suggests it spent significant time in trees, likely to avoid large predators like saber-toothed cats and hyenas.
- Dietary analysis shows major differences: Lucy’s kind ate a broad diet—grasses, fruits, and nuts—while deyiremeda stuck to foods from trees and shrubs.
- Chemical analysis of tooth enamel revealed distinct dietary adaptations supporting the coexistence and niche separation between these two species.
Why Does This Matter for Science and Humanity?
The revelation that multiple hominins lived side by side upends long-held assumptions about our origins. It demonstrates that evolution is rarely a straight line—species experiment, coexist, and sometimes directly compete for resources [Reuters]. This new perspective answers some questions—and raises new ones:
- How did these species interact? Did competition or cooperation influence the traits that survived?
- Did dietary flexibility (as seen in Lucy’s kind) provide a competitive advantage, or did specialization (as in deyiremeda) protect a niche?
- Could there be more unrecognized species in the hominin fossil record, representing other lost evolutionary experiments?
As Naomi Levin, geochemist and co-author, notes: understanding the varied adaptations and co-existence of these early ancestors brings us closer to solving the puzzle of how and why our own species ultimately flourished.
The Human Impact: Our Place in a Complex Ancestry
This research reshapes our own narrative. Rather than seeing ourselves as the inevitable result of a single unbroken line, we learn that humanity emerged from a web of competing and adapting species. Each branch—successful or extinct—helped forge the resilience, adaptability, and diversity of today’s humans.
By uncovering evidence of multiple evolutionary paths, these discoveries underscore the importance of scientific investigation and international collaboration in unraveling the stories written in ancient bones.
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