True Wild Life | Mule | A mule is the result of the mating of a male donkey (jack) and a female horse (mare) to produce a hybrid. The much rarer hinny is the result of mating a female donkey (jennet) with a male horse (stallion) although the hinny is much harder to produce than the mule. The jennet's reproductive system is more efficient at detecting and eliminating foreign DNA than the mare's is. The hinny conception rate is lower and the miscarriage rate is higher. It really isn't possible to distinguish a mule from a hinny by appearance. Mules are anatomically normal and show normal breeding behavior unless gelded (castrated) early in life.
