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A new study finds that horse whinnies are made of both a high and a low frequency, generated by different parts of the vocal tract. The two-tone sound may help horses convey more complex information.

Rats are one of the most enduring symbols of New York City. An estimated three million rats live in the city, which is a ...

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.