A mule is the result of a donkey stallion mating with a female horse. Mules tend to have the head of a donkey and the extremities of a horse. Mules are sterile and cannot reproduce. A hinny is the opposite of a mule – the result of a horse stallion mating with a female donkey. Mules require less food and have more stamina than horses of the same weight and height, making them resilient working animals in some of the harshest environments. Some mules have been known to live until 50, though the average lifespan is between 35 and 40 years.
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