If you have ever held a tiny kitten, it is hard to believe that the soft rumble you feel starts just days after birth. Kittens are born blind and deaf, yet they begin purring almost immediately.

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.

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