The scientific consensus has been telling us for decades that the cradle of humanity and the origin of our ancestors who began to walk on two legs was in Africa. However, a new paleontological discovery in the Balkans just launched an order to this official story. More specifically, a fossilized femur that suggests our earliest ancestors may have started walking on two legs in Europe.
A bone. The centerpiece of this discovery is a femur cataloged as FM3549AZM6 and found at the Azmaka site, in Bulgaria. From this, the research team began to analyze the bone down to the millimeter, highlighting above all the anatomy it had.
Researchers here have identified key biomechanical traits that point to partial bipedal locomotion, meaning that our ancestor could walk on two legs. Specifically, they have seen that the neck of the femur is unusually long and it has specific muscle insertion points that strictly arboreal primates do not have. These characteristics suggest that Graecopithecus He spent considerable time walking upright on the ground.
A new hypothesis. This finding does not come out of nowhere, since in 2017 this same team of researchers already raised eyebrows in the scientific community by suggesting that the evolutionary divergence between humans and chimpanzees could have occurred in the eastern Mediterranean, and not in Africa. That hypothesis was based on analysis of a jaw found in Greece and a tooth from Bulgaria attributed to Graecopithecus freybergi. Now it comes to light again.
At that time, definitive proof of locomotion was missing, but Azmaka’s femur fills that gap that we needed to begin to reach clear conclusions.
Why did they stand up? Evolution rarely occurs without a strong environmental push, and the Europe of 7 million years ago looked nothing like it does today. Here investigations at Bulgarian sites, such as the Struma Valley, show that the landscape was dominated by a savanna environment very similar to the African one, caused by a global confrontation and severe droughts in the Mediterranean.
This loss of dense forests would have forced the region’s primates to come down from the trees and adapt their movement to travel long distances in open fields in search of food. In this way, it was geography and not the continent that forced bipedalism.
The debate. The new Bulgarian femur revives one of the hottest debates in paleontology, since until now, the title of the oldest bipedal hominin was held by Sahelanthropus tchadensisabout 7 million years old and found in Africa. But now, if this team’s dating and analysis are accurate, Graecopithecus would not only equal, but slightly surpass in seniority Sahelanthropusmoving the “kilometer zero” of bipedalism to the Balkans.
But at the moment it is too early for the textbooks to change definitively, since, as with previous discoveries, the scientific community will demand more independent analyzes and will seek to debate every notch of the femur. What is undeniable is that the African monopoly on the origin of our lineage now has a serious European competitor.
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