Jane Goodall has studied chimpanzees since 1960. She observed how chimpanzees use tools in several ways. They will pick up rocks to crack nuts for a meal. They also strip down twigs and stick them into a termite mound to collect a tasty snack. Some have been known to make a sponge from leaves in order to hold more drinking water. The chimp chews leaves to soften them up, dips them in rainwater, and then squeezes the water into its mouth. Chimpanzees are also known to think ahead and solve problems.