Mule
Mules (not the bird) are a cross between a male donkey and a female horse and demonstrate the best traits of both the horse and the donkey. These animals are much more tolerant than a horse and also have more stamina, while at the same time are far less stubborn than a donkey and are much more intelligent.
The size of the mules varies and is basically dependent on the size of the female horse that is mated with the male donkey. Male mules are always sterile while the female mules at times can conceive.
