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Mules are not a species, they are a hybrid between two other species - Equus assinus (the donkey) and Equus caballus (the horse). A species is usually defined as a group of animals that can reproduce like examples, and the mule cannot reproduce.
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www.lovelongears.com/faq.html
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Both male and female mules have all the correct "parts" but they are sterile and cannot reproduce. A VERY few (about 1 in 1 million) mare mules have had foals, but these are VERY, very rare. No male mule has ever sired a foal.
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www.lovelongears.com/about_mules.html
www.lovelongears.com/about_mules.html
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Mule - Wikipedia, the free encyclopedia
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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 ...
en.wikipedia.org/wiki/Mule
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Related resource areas: Horses ... The horse has 64 chromosomes (32 pairs), and the donkey has 62 (31 pairs). When they are mated, the mule receives 63 chromosomes (32 from the horse and 31 from the donkey). During meiosis, the chromosomes are not in pairs, and, as their number is halved, the sex cells ... Have a specific question?
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www.extension.org/faq/268
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Description of the Gaited Mule ... Because Mules are a cross between Two different Species, they are Sterile meaning they can not reproduce. One reason mules cannot reproduce is because they lack functioning reproductive equipment. The males don't produce sperm capable of fertilizing an egg.
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www.gaitedhorses.net/GaitedMule.html
www.gaitedhorses.net/GaitedMule.html
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Because the resulting progeny is a hybrid, mules do not reproduce. Practically 100 percent of male mules are sterile. Female mules go into a "false heat," and in very rare circumstances they can become pregnant. When there is a cross between a female donkey (jenny) and a horse, the result is what is known as a "hinny".
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earthstar.tripod.com/mules.html
earthstar.tripod.com/mules.html
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Fun stuff about mules, trail rides, wagon trains, antiques and collectibles ... Mules are sterile and cannot reproduce. This does not affect the normal sex drive, though, and mules will breed, if not conceive. There have been stories through the years of mare mules giving birth, but to my knowledge, none have been substantiated.
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www.phudpucker.com/mules/mule.htm
www.phudpucker.com/mules/mule.htm
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