264 



Why Living Tlmigs Behave As They Do unit v 



Fig. 249 Well constructed dmns like this one can be built by beavers that have never 

 seen a dam. As you may already know, beavers build houses in the ponds made by 

 dams like this. In the fall they gather and store food which is 7ised dxiring the winter. 

 How can you explain their activities? (national park service) 



Fig. 250 Youjig quail in a 

 nest on the ground, photo- 

 graphed from above. Where 

 is the head of each bird? 

 What advantage is there in 

 this position? Did the young 

 birds think up this good de- 

 vice for protecting them- 

 selves? (gehr) 



