https://www.aljazeera.com/features/2017/9/8/the-decline-of-chinantec-whistled-speech-in-mexico
The whistled speech comprises seven tones and can be understood at distances of up to one kilometre away.
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https://www.straitstimes.com/sport/cycling-froome-whistled-and-booed-at-tour-de-france-presentation
LA ROCHE-SUR-YON, France (AFP) - Four-time winner Chris Froome was roundly booed by the crowd that gathered for the teams presentation of the Tour de France in...
tour de francecyclingfroomewhistledbooed