▶Whistled language
Whistled language. This truly boggled my mind. From Wikipedia: “Whistled languages use whistling to emulate speech and facilitate communication. A whistled language is a system of whistled communication which allows fluent whistlers to transmit and comprehend a potentially unlimited number of messages over long distances.” I suggest watching this video first and then this video to see and hear the Mazatec whistle language in action.— Tim Ferriss