The bone tools were created the same way tools were made from stone.

The excavation of bone tools at Olduvai Gorge in Tanzania expands the range of ancient hominids’ cultural innovations.

"The study indicates our ancestors used subtly different techniques to create ... All but one of the 27 tools were made from elephant or hippo bone. Hippos were common in the area but elephants were ...

a finding that suggests our ancestors were much smarter than previously thought, a new study reports. The tools, made from hippo and elephant leg bones, were discovered at Olduvai Gorge in ...

"The study indicates our ancestors used subtly different techniques ... All but one of the 27 tools were made from elephant or hippo bone. Hippos were common in the area but elephants were not ...