Reporter Ari Daniel Shapiro tells us about Klaus Zuberbuhler's work in the Tai Forest of West Africa. When Klaus first came to the forest, he hit a wall of sound. But he slowly started making sense of that sonic chaos by scaring a particular monkey called the Diana Monkey. Turns out, the Diana Monkey is making more than just noise. We travel with Klaus into the woods as he tells us about one day when the cacophony of monkey calls were distilled into a life-saving warning.