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Loud, piercing and sharp...a whistle is hard to ignore. But whistling languages are in danger of dying out. But residents of Kusköy on the Black Sea coast still communicate by whistling.An ee sounds higher than an ah. Consonants are distinguished by changes in pitch over different intervals of time. Eskimos communicate with whistles; so do indigenous people in the Amazon, and in Europe shepherds keep boredom at bay and communicate by whistling to each other. But the world's 70 whistling languages are slowly becoming extinct. Kusköy in Turkey is defending the tradition.