156 WATCHED BY WILD ANIMALS 
the wolves have enlarged; or it may be a natural 
cave. In the woods it may be in a huge hollow 
tree. Almost invariably a pair has a den to 
themselves. I have heard of a few instances 
where two litters of wolf puppies were found 
in the same den; but probably the second lit- 
ter, in an emergency, had been moved into the 
den for safety. 
Wolves within the bounds of the United 
States are not ferocious; they do not attack 
human beings. That they were once fero- 
cious is probable; but years ago they learned 
the folly of exposing themselves to human be- 
ings. 
Notwithstanding all this, the wolf is not a 
coward. He is brave enough when anything 
is to be gained by being brave. The spectacu- 
lar, reckless, grand-stand bravery that is pretty 
certain to be accompanied by death does not 
appeal to the wolf. Instances are on record, 
however, where numbers of wolves have risked 
their lives in order to save or to try to save 
a wounded companion, either from men or 
from animals. 
A man captured and brought home a number 
of wolf puppies and placed them in a box in- 
side a high picket fence. He thought the 
mother might come to their rescue and pre- 
pared to entrap her. He took off a picket of 
