A few small rodents like rats and mice whistle like this, but horses are the first known large mammal to have a knack for it.
The sound of a horse's whinny is created by the low frequency vibration of vocal cords combined with a high frequency whistle, a new study reveals.
COLUMN. To produce this unique sound, the horse performs a 'biphonation': It cries out and whistles at the same time.
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