An international research team led by scientists from La Trobe University in Australia and the University of Cambridge is questioning how one of the most complete early human fossils has been classified.

facebook icon The generally accepted theory of the spread of ancient humans from Africa, where they first evolved, known as "Out of Africa," holds that a single species, Homo erectus, subsequently migrated to populate portions of Eurasia approximately 1.

For decades, researchers have argued over whether a fossil that is about seven million years old could walk on two legs.