PLATE 37 



('. Work of Yellow-haired Porcupine on branches of prostrate loilgepole pine. Photo- 

 uiapluMl at Porcupine Flat, 8100 feet altitude, July 1, 1915. See text, p. M;',. 



/;. Dam made by Golden Beaver in slough formed by gold dredger in the Merced 

 Eiver bottom near Snelling. Photograph taken January 0, 191."). Altho igh !-mall, this 

 dam shows typically the method of construction employed by this rodent. See text, 



p. 2i(;. 



'iiii 



