mules (mammals)

Scope note: Hybrid offspring produced by the mating of a female horse and a male donkey. The less-frequent cross between a female ass and a male horse results in a hinny, or hinney, which is smaller than a mule. Mules were beasts of burden in Asia Minor at least 3,000 years ago and are still used today in many parts of the world because of their ability to withstand hardships and perform work under conditions too severe for many other draft and pack animals. Mules are usually sterile.

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