Anthropologist D. Carl Johanson made a significant discovery in Ethiopia of bones that belonged to an ape man (hominid) of the genus Australopithecus, with a skull fragment, shin, and thigh bones dating back to 3 million years ago. This discovery provided new insights into the timeline of human evolution and the emergence of upright walking.
However, despite this discovery, the exact timing of when upright walking emerged in the evolutionary history of humans remains a topic of debate among paleontologists. Fossil analyses suggest that several hominid species were walking on two legs between 5 million to 7 million years ago. The oldest known evidence of upright walking comes from a 7-million-year-old Sahelanthropus tchadensis, whose upper leg bone bears signs of upright walking.
Some scientists have raised concerns that the bone attributed to Sahelanthropus tchadensis may have belonged to an ape that occasionally walked upright. This ongoing debate highlights the complexity of interpreting fossil evidence and the need for continued research and analysis in the field of paleoanthropology.
The discovery made by Johanson has been widely accepted as evidence that our ancestors walked on two legs over 3 million years ago. However, there is still much debate about when exactly this happened and how it occurred.
The fossil record suggests that several hominid species were bipedal before 5 million years ago, with some even exhibiting features like flat feet and large toes that are characteristic of modern humans.
Despite this evidence, there are still those who argue that bipedalism was not a fully developed trait until much later in human history.
One such scientist is Dr. Richard A. Walker, who has spent decades studying human evolution. He argues that while certain hominids did walk on two legs earlier than others, bipedalism was not fully established until around 2 million years ago.
Dr. Walker points out that even today’s modern humans still retain some vestiges of our arboreal past in our bone structure and musculature.
Overall, while there may never be definitive answers to all questions about human evolution, continued research will undoubtedly shed more light on this fascinating subject.
As such, it is crucial for scientists to continue studying fossils and analyzing data to gain further insights into how our ancestors evolved over time.
Through these efforts, we can hope to uncover more secrets about our own origins and better understand where we came from as a species.