Anthropologist D. Carl Johanson made a groundbreaking discovery in Ethiopia of a skull fragment, shin and thigh bones belonging to an ape man (hominid) of the genus Australopithecus. The 30-year-old scientist stated at a news conference, “We have absolute, concrete evidence that our ancestors walked on two legs over 3 million years ago.”
Fossil analyses suggest that several hominid species ambled around on two legs about 5 million to 7 million years ago. However, not all paleoanthropologists are convinced those features prove a two-legged gait. Some scientists think the bone belonged to an ape that may have walked upright at times.
Questions or comments on this article can be directed to email@example.com. Previously the staff writer for physical sciences at Science News, Maria Temming is now the assistant editor at Science News Explores. She has bachelor’s degrees in physics and English, and a master’s in science writing. This article was supported by readers like you. Invest in quality science journalism by donating today.