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Five-Year Study Suggests Chimpanzees Strike Stones Against Trees As Form of Communication
Chimpanzees act as 'engineers', choosing materials to make tools
Chimpanzees' stone tool choices may mirror ancient human ancestors' techniques
Chimpanzees' performance on computer tasks changes when people watching them
Old videos of chimpanzees suggest they are capable of speech
Chimpanzees 'self-medicate' with healing plants
