Gruber and colleagues' (2009) work with chimps involving a deep drilled hole filled with honey found that chimps from the troops that usually used leaves to obtain food used _____ in the new context, while chimps that that usually used sticks used ______ in the new context.

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Gruber and colleagues' (2009) study found that chimps adapted their existing tool-use behavior to a new context. Chimps that typically used leaves to obtain food continued to use leaves to try to extract honey from a deep hole, while chimps that usually used sticks employed sticks in the new context. This demonstrates the chimps' ability to generalize their tool use based on previous experiences.

Gruber and Colleagues' (2009) Work with Chimps Involving a Deep