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In its common modern meaning, a mule is the offspring of a male donkey and a female horse. Compare hinny – the offspring of a male horse and a female donkey. The term "mule" (Latin mulus) was formerly applied to the offspring of any two creatures of different species – in modern usage, a "hybrid". The mule, easier to breed and usually larger in size than a hinny, has monopolised the attention of breeders. The chromosome match-up more often occurs when the jack (male donkey) is the sire and the mare (female horse) is the dam. It has been known for people to let a stallion (male horse) run with a jenny (female donkey) for as long as six years before getting her pregnant. Mules are almost always sterile (see fertile mules below for rare cases), as almost all hinnies are. (see External links). The sterility is attributed to the different number of chromosomes the two species have: donkeys have 62 chromosomes, while horses have 64. Their offspring thus have 63 chromosomes which cannot evenly divide.

A female mule, called a "molly", has estrus cycles and can carry a fetus, as has occasionally happened naturally but also through embryo transfer. The difficulty is in getting the molly pregnant in the first place.

Mules are considered more intelligent than both horses and donkeys.

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Equidae :: Perissodactyla
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RT @LostTeapot182 If donkeys are asses and mules are part donkey, is that why we always half-ass things at Wilson?
SurrealMystery (SurrealMystery) Thu, 10 Dec 2009 00:08:14 -0000
RT @LostTeapot182 If donkeys are asses and mules are part donkey, is that why we always half-ass things at Wilson?

 
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