BEAVER HABITS, BEAVER CONTROL, AND BEAVER FARMING. 3 



fecting the topography of vast areas through an unknown period. 

 Before considering the question of controlling these natural engi- 

 neers or of utilizing them in beaver farming, it is important to con- 

 sider their physical character and remarkable habits. 















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Fig. 1. — Range of beavers and their principal food tree, the aspen. The beaver was one 

 of the most widely distributed mammals in North America, as shown by the heavy line 

 bordering its original range. It now occupies about half of its original territory. The 

 aspen or poplar (Populus trem<uloicles and varieties) is the most widely distributed tree 

 in North America, as shown by the shaded area on the map, filling the Canadian and 

 Hudsonian Zones and overlapping slightly into the upper edge of the Transition Zone. 

 It marks the area of suitable climate for beaver farming and furnishes the best beaver 

 food. 



