In 1960, a researcher named Jane Goodall began to live with and study wild chimpanzees in Africa.

Years of observations by biologists Dian Fossey, who observed gorillas, and Jane Goodall, who worked with chimpanzees, could not prove that animals cry tears from emotion.

Both he and primatologist Jane Goodall have observed chimpanzees dancing with total abandon at waterfalls that emerge after heavy rains.