Documentary: Villages use whistle communication

Remote Village Communication (3:30) For centuries, residents of Kuşköy have communicated over rural Turkey's vast distances with kuş dili, which literally means "bird language." Like other forms of whistled communication, kuş dili arose in a region where the rugged ground and sparse population made travel difficult even over short distances. A whistle can reverberate for more than a kilometer, according to Kodalak. "If you can't make your voice heard over a long distance, you could also make a chain with different people relaying the message." Read More (Atlantic Magazine)