Chimpanzees in Tanzania's Gombe Stream National Park have been found to craft flexible tools for termite fishing, indicating a sophisticated understanding of material properties. Researchers discovered that the primates carefully select plants that are 2.75 times more flexible than others, suggesting an engineering skill in tool-making. The study suggests that chimpanzees possess an intuitive comprehension of material properties, which may be deeply rooted in their tool-making culture. This finding has implications for understanding human tool use and the technical abilities associated with early human technological evolution.