The animal is described as a sea cow or a hippo with frog legs and it lived ... There’s much that scientists don’t understand ...

All but one of the 27 tools were made from elephant or hippo bone. Hippos were common in the area but elephants were not, meaning their bones were probably carried to Olduvai Gorge from elsewhere ...

When a bull elephant and hippo meet in a watering hole, it's not always a peaceful coexistence. In the accompanying footage, captured by Scott Hyman in Botswana, South Africa, the much larger ...