In Ethiopia, found stone tools of the Acheulean and Oldowan cultures in close proximity to the skull of Homo erectus (Homo erectus), reported in Science Advances. Combination of guns of the two cultures may indicate that the species is very plastic in their behavior. In addition, the discovered skulls have significant morphological differences, indicating probable sexual dimorphism of erectus.
Even chimpanzees use stones as tools, and among members of the genus Homo the role of the first user of guns is generally attributed to the person skilful (Homo habilis). He probably inherited the technology of their creation from Australopithecus. Primitive stones used by the skilled person, called tools of the Oldowan culture, they appeared about 2.5 million years ago.
Younger and more advanced species, Homo erectus (Homo erectus), used the advanced tools of the Acheulian culture. It is believed that with the advent of the Oldowan culture are gone. Although stone tools are rarely found in close proximity to the actual remains of people, often Acheulian hand-axes tied to the erectus, and the Oldowan scrapers and choppers (it is believed that in Olduvai was more than a simple “protrusile”) to habilian within the concept of “one species, one culture”.
The discovery of a group of paleo-anthropologists from Spain and USA, made in the framework of the project “the Rut” Ethiopia under the leadership of Silesi Semo (Sileshi Semaw), casts doubt on this hypothesis. Scientists have discovered fragments of two skulls believed to belong to Homo erectus, and next to them in the same stratigraphic layer (at a distance of 1-2,5 meters) — axes and scrapers of the Oldowan and Acheulian cultures. According to the researchers, this means that people used these guns.