462 



Life-histories of Northern Animals 



— > tJLAVE 



FiG- 132 — Plan of a Beaver burrow. 

 (From Morgan.) 



Fig. 133 — Ground- plan of a bank-lodge, 

 (From Morgan.) 



FALSE 

 LODGE 



VENTILA 

 TION 



Fig. 134 — Ground-plan of a more elaborate bank-lodge, showing the nearly straight 



wood entrance in dead water, and the Beaver entrance in the running stream. 



(From Morgan.) 



ground chambers, which are ahvays found near the surface."-' 

 The individuals that Uve in these are called * Bank Beavers.' 

 I saw numerous examples of their work on the Nyarling River, 

 Mackenzie District, in June, 1907. 



In many cases their entrance is protected with a mass of 

 sticks, which also is winter food. This pile is called a 'false 

 lodge.' 



A higher development of the false lodge is seen when it 

 is made by a lake. Then there is no annual freshet to carry 

 away the pile, so it grows yearly. 



Over the chamber in the bank is a thin place made to 

 admit air. In the course of time this ventilator may give way, 



** Ihid., p. 159. . 



