The species call is a whinnying cackle of 2 to 5, usually 4 notes, "woikwoikwoikwoik", the initial being higher in pitched and the middle note being distinctly lower.
Instead, a mule makes a sound that is similar to a donkey's but also has the whinnying characteristics of a horse (often starts with a whinny, ends in a hee-haw).
Flocks may produce a whinnying sound that rises and at in the breeding season produce whistling "kew-ki-ki" notes.
After initially irritating the other horses with his worried whinnying, he apologizes and becomes good friends with them.
They have a distinctive shrill whistle followed by a rapid whinnying call.
