The sterility of a mule is accredited to the difference in the number of chromosomes that a donkey and a horse possess. That is, while horses have 64 chromosomes, donkey's posses just 62. The mule, their offspring as a result have 63 chromosomes and these cannot evenly divide. However it is important to note that there are exceptions to the rule and there have been documented cases where female mules have succeeded in producing offspring after they were mated to either a purebred horse or ass.
The collective noun for mules is a barren of mules. They are also often called a rake of mules.
It is interesting to note that, in general, mules are thought to be more intelligent than horses and donkeys.
The collective noun for mules is a barren of mules. They are also often called a rake of mules.
It is interesting to note that, in general, mules are thought to be more intelligent than horses and donkeys.
