BEAVER LODGES AND BURROWS. 



161 



This burrow (Fig. 16) is on the east side of the lake, 

 a few rods south of the outlet of Lake Diamond. There 



Fig. 16. 



Pond 

 Ground Plan of Beaver Burrow at Grass Lake. 



are two entrances, separated by a stone, and roofed 

 over with roots and earth. The one upon the right 

 side passes under the edge of a rock; the one on the 

 left, under the roots of a tree; and both are two feet 

 below the surface of the water. Within the distance 

 of fifteen feet from the pond, the bank rose about 

 seven feet above its level. The burrow rose also with 

 the bank, so that at the distance of eight feet from 

 its mouth, the roof of the burrow came within six 

 inches of the surface of the ground above, and at its 

 extreme end within three inches, the roots of the 

 overspreading forest trees forming a covering of suffi- 

 cient strength. It was evidently carried thus near 

 the surface for the admission of air through the 

 ground roof. The chamber, in its most capacious 

 portion, was a foot high and twenty inches wide. 

 With its branches it would afford ample accommoda- 

 tions for a beaver family. I found it accidentally by 

 observing a small opening into it at its extreme end, 

 which enabled me to open the remainder of it easily 



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