9×12 watercolor enhanced colored pencil. Original available. As of 05-08-12, 545 views and 5 favorited.

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A mule is the offspring of a male donkey and a female horse. Horses and donkeys are different species, with different numbers of chromosomes. Of the two F1 hybrids between these two species, a mule is easier to obtain than a hinny (the offspring of a male horse and a female donkey). While there is no known instance of a male mule siring offspring, female mules have on very rare occasion given birth to viable offspring. The size of a mule and work to which it is put depends largely on the breeding of the mule’s dam. Mules can be lightweight, medium weight, or even, when produced from draught horse mares, of moderately heavy weight.

An aficionado of the mule claims that they are “more patient, sure-footed, hardy and long-lived than horses, and they are considered less obstinate, faster, and more intelligent than donkeys.”

A female mule that has estrus cycles and thus, in theory, could carry a fetus, is called a molly or Molly mule, though the term is sometimes used to refer to female mules in general. Pregnancy is rare, but can occasionally occur naturally as well as through embryo transfer. One of several terms for a gelded mule is a John mule(info from Wikipedia).

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