316 



The Journal of Heredity 



A BEAVER LODGE 



Figure 15. Beaver houses are made of mud and sticks and their construction repre- 

 sents no mean feat of strength and skill for the little animals. The branches of a 

 winter food-cache of sunken wood are visible on the left, the buds and bark being the 

 parts that are relished. Photograph from U. S. Biological Survey. 



BEAVER WOODCRAFT 



Figure 16. Yellow poplars cut by beavers for food and building material. Aspens, 

 poplars, and cottonwoods are favorite food and easily cut. Canals are dug in which to 

 float the trees to the pond. Photograph from U. S. Biological Survey. 



