128 
MAMMALS 
long time from a small animal about the size of a fox terrier. 
The earliest remains of the feet of the ancient horse show 
that it had four toes and the remains of a fifth in the front 
foot, while the hind foot had three toes and the remains of 
a fourth. The horse and the deer, which also has many 
Figure 118. — An International Champion Draft Horse of the 
Percheron Breed. 
Compare the size of the neck, shoulders, and hips with the same parts of the 
trotter breed in Figure 119. What kind of work can this horse do best? 
stages preserved in the rocks, afford examples of the manner 
in which some of our present animals have developed. 
The domesticated horses were developed in the old world. 
In the warmer regions, where food was plentiful, the larg¬ 
est horses developed, while in the north, where food was 
less abundant and the conditions were more severe, the 
Shetland pony appeared. Most breeds of horses were de- 
