Thanks to Rosemary W.
Ed note: I spent a whole summer at camp learning how to do a shrill whistle, but never thought I could ask for a loaf of bread! Much more interesting than an iPhone for communication.
In a remote mountain village high above Turkey’s Black Sea coast, there are villagers who still communicate across valleys by whistling. Not just whistling as in a non-verbal, “Hey, you!” But actually using what they call their “bird language,” Turkish words expressed as a series of piercing whistles.