Our human ancestors were using stone tools and eating meat from large mammals nearly a million years earlier than previously thought, according to a Nature study that pushed back both of these human activities to around 3.4 million years ago.
The first known human ancestor tool-wielder and meat-lover was Australopithecus afarensis, according to the study. This species, whose most famous representative is the skeleton "Lucy," was slender, toothy and small-brained.
"By pushing the date for tool use and meat-eating in our lineage back by around 1 million years, our finds show that tool use and meat-eating was not unique to (the genus) Homo," co-author Zeresenay Alemseged told Discovery News.
"Also, by showing that A. afarensis was involved in these activities, we showed that you do not need a large brain to do this," added Alemseged, director of the Department of Anthropology at the California Academy of Sciences.
Brown agrees that braininess may not always explain how much or little certain species use tools.
"Are there physical and or ecological constraints on tool use?" he said. "Hopefully if we do this we can get away from the notion that 'humans use tools so tool-users must be smart like humans.' That idea seems to be leading us in circles."