Researchers focused on engravings made on the shell, and drew a cartoon to help people visualize the carvings. Perhaps Homo erectus used a sharp point, such as a shark's tooth, to make the etching, the researchers said. (Joordens et al. | Nature)
The ancient, big-bodied relatives of modern-day humans not only ate freshwater shellfish, but engraved their shells and used them as tools, a new study finds.