"Despite their interest to both linguists and casual observers, whistled languages are disappearing rapidly all over the world, and some — such as the whistled form of the Tepehua language in Mexico — have already vanished. Modernization is largely to blame, says Meyer, who points to roads as the biggest factor. “That’s why you still find whistled speech only in places that are very, very remote, that have had less contact with modernity, less access to roads,” he says."
"Despite their interest to both linguists and casual observers, whistled languages are disappearing rapidly all over the world, and some — such as the whistled form of the Tepehua language in Mexico — have already vanished. Modernization is largely to blame, says Meyer, who points to roads as the biggest factor. “That’s why you still find whistled speech only in places that are very, very remote, that have had less contact with modernity, less access to roads,” he says."