Researchers believe the tool was crafted by Homo erectus, making this only the second time they have found a non-stone tool made by this human ancestor.

Archaeologists say stone-made hand axes are a pretty common find. But researchers were stunned when they found that a prehistoric hand ax unearthed in Ethiopia had been carved out of the thigh bone of a hippopotamus.

According to Ars Technica , Katsuhiro Sano, an archaeologist from Japan’s Tohoku University, and his team identified a 1.4-million-year-old hand ax buried underneath ancient layers of sediment.

The discovery happened while the team was working at the Konso Formation, an exposed stone formation from the Pleistocene era, between 2,580,000 to 11,700 years ago, located at the southwestern end of the southern part of the Main

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