A 4.4 million-year-old partial skeleton found in Ethiopia is providing new insights into how early humans began to walk upright. The skeleton, known as "Ardi," belonged to a female of the species Ardipithecus ramidus, which is considered to be a transitional species between apes and humans.

One of the most significant features of Ardi is her pelvis, which is remarkably similar to that of modern humans. This suggests that Ardi and her species were already well-adapted to walking upright, even though they also spent time in the trees. This challenges the traditional view that humans evolved upright walking relatively recently, and suggests that it may have been a key adaptation for our ancestors as early as 4.4 million years ago.

In addition to its implications for understanding human evolution, the discovery of Ardi is also significant because it sheds light on the environment in which early humans lived. The site where Ardi was found is a desert today, but millions of years ago it was a lush forest. This suggests that early humans were able to adapt to a wide range of environments, and were not confined to the savannas that are often associated with human evolution.

The discovery of Ardi is a reminder that human evolution is a complex and dynamic process, and that there is still much that we do not know about our origins. With each new discovery, we are coming closer to understanding how we became the human beings we are today.