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A horse’s whinny begins as a piercing, high-pitched screech that’s soon joined by a lower, guttural rumble. But the two components of the call don’t differ just in tone—they’re made in entirely different ways, researchers report.
The lower tone emerges when the horse vibrates its vocal folds, much as a human does to speak. To make the high note, the horse whistles.
The observation provides the first experimental evidence that a mammal can produce a whistle and a vocal-fold vibration at the same time.
IMAGE CREDIT: ELODIE BRIEFER
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