Once upon a time, we humans believed that our use of tools separated us from other animals. But Jane Goodall knocked the stuffing out of that theory in 1960, when she discovered a group of chimpanzees who fished for termites with sticks. Tool use has since been observed in many animals, and scien- tists want to know how each species learns it. Does the information come hard-wired, or do they pick it up by watching others?
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