26 FARM ANIMALS 
WOLVES IN CAPTIVITY 
These animals are trained but not domesti- 
cated. 
the cat kind of animals, 
the domestic cat only 
has been plastic enough 
to meet the severe de- 
mands of man’s civiliza- 
tion. Yet enormous 
numbers of closely al- 
lied species have been 
tamed and have pro- 
duced young, but have 
never become domestic. 
Back of this universal 
law is the fact that few 
species are domesticable. 
7. Animals as a prime 
motor.—Working alone 
and unaided, man would 
have a sorry existence. 
His tasks would be too 
great and severe for his 
frail body and_ erect 
structure. When he 
trained animals to carry 
his burdens and do his 
heavy work he not only 
conserved his own 
strength, but increased 
his productive power. 
This gave an added in- 
centive to advance; he 
saved time, enabling 
him to think and plan, 
and allowed him to gain 
in substance for protection and future needs. 
