152 FARM ANIMALS 
loads on their backs, and move slowly and patiently, 
but with great sureness of foot over the narrow, dan- 
gerous, rocky passes. Many of these animals are used 
in mines, where they perform steady service for a great 
many years. 
a 
Burro AT WorK 
These little beasts, while not in general use on farms, are willing workers and 
never complain at any task to which they may be put. 
9. The mule.——The mule is a hybrid, not a breed. It is 
a mongrel product, having a jack for sire and a mare 
for dam. If the breeding is reversed, the product is 
known as a hinny, but this is always inferior to the first- 
named cross, The mule is tall and strong, corresponding 
to the horse in height and in the shape of the neck, 
shoulders and body, while the form of his head, his long 
ears, his thin, wiry legs and narrow hoofs are the in- 
heritance of his father, the ass. The mule has better style 
and finish and better bone than the hinny and greater 
size. Hinnies, while homelier in appearance, are never- 
