Final answer:
Chimps that normally used leaves in their original habitat continued to use leaves in a new context, while chimps accustomed to using sticks did the same with sticks. This reflects the primates' ability to adapt tool use, indicative of their intelligence and the presence of cultural behaviors.
Step-by-step explanation:
Gruber and colleagues (2009) found that chimps from troops that usually used leaves to obtain food used leaves in the new context, while chimps that usually used sticks used sticks in the new context. This study is an example of primates' ability to use tools and adapt their tool use based on their experiences and environment. The fact that different groups of chimpanzees developed distinct tool-using behaviors is evidence of behavioral diversity within the species, often influenced by the availability of resources and the specifics of their habitat.
The evidence from years of observation, including the work of pioneers such as Jane Goodall, shows that chimpanzees can fashion and utilize a variety of tools for different purposes, such as termite-fishing and hunting. In different environments, they have been observed using tools in unique ways, indicating a flexibility in behavior and cognition. This ability to adapt to new circumstances by choosing an appropriate tool from past experiences highlights an aspect of primate intelligence and the possibility of what can be described as a form of culture in non-human species.