58 WATCHED BY WILD ANIMALS 
colony is not continuously occupied this long. 
A flood, fire, or the complete exhaustion of food 
may compel him to move and seek a new home. 
In abandoning the Broken Tree pond, one 
set of dwellers simply went up stream and took 
possession of the pond which the landslide had 
formed. Here they gathered supplies and dug 
a hole or den in the bank but they built no 
house. An underground tube or passageway 
connected this den with the bottom of the pond. 
The remainder of the colonists started anew 
about three hundred feet to the north of the 
old pond. Here a dam about sixty feet long 
was built, mostly of mud and turf excavated 
from the area to be filled with water for their 
pond. They commenced their work by digging 
a trench and piling the material excavated on 
the lower side—the beginning of the dam. This 
ditch was then widened and deepened until the 
pond was completed. All excavated material was 
placed upon the dam. 
Evidently the site for the house, as well as 
for the pond, was deliberately selected. The 
house was built in the pond alongside a spring 
which in part supplied the pond with water. 
The supply of winter food was stored in the 
deep hole from which the material for the house 
was excavated. The water from the spring 
checked freezing near the house and the food- 
