Gombe was where Dr. Jane once famously observed chimpanzees making and using tools. But she also observed another very interesting chimpanzee behaviour while there – at the onset of storms, they would make dramatic and rhythmic displays involving charging, branch dragging, and swaying motions. This "rain dance" isn't part of aggression or mating rituals, but seems to occur in response to heavy rains, thunder, or waterfalls. Researchers hypothesize that this behaviour could reflect emotional resp