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A horse’s whinny can sound like two calls at once. One part sits low and rough, like a familiar mammal voice. Another rides high, almost piercing, and it does not seem to fit a 500-kilogram animal.

Horses whinny to find new friends, greet old ones and celebrate happy moments like feeding time. How exactly horses produce that distinctive sound – also called a neigh – has long eluded scientists.

To continue reading this content, please enable JavaScript in your browser settings and refresh this page. Digital media company Team Whistle has acquired Tiny Horse ...