Roosevelt Wild Life Bulletin 



109 



PAGE 



Figure 47. Lost Lake, near Camp Roosevelt. A party of naturalists and 

 boys from the Forest and Trail Camp on a beaver st udy excur- 

 sion. Photo Alvin G. Whitney 198 



Figure 48. Upper beaver meadows on Lost Creek above Yanceys, showing 

 old dam. These were large ponds when Ernest Thompson 

 Seton studied them in 1897 198 



Figure 49. Side view of skull of a beaver, showing the chisel-like character 



of the front teeth 201 



Figure 50. Cottonwood tree partly cut by a beaver. The rule in the cut is 



2 feet long. Trinchera Estate, Costilla County, Colorado, 

 May 11, 1913 201 



Figure 51. Large aspen partly cut by beaver. The tree measured 4.6 feet 



in circumference above the notch. Photographed July 22, 192 1. 202 



Figure 52. The large aspen after it had been felled. Photographed Sep- 

 tember 4, 1 92 1. It was still standing August 28. The rule 

 on the stump is six inches long 202 



Figure 53. Beaver house and trails in snow. Near Slate River, 2.5 miles 

 above Crested Butte, Gunnison County, Colorado, Oct. 20, 



1905 • 205 



Figure 54. Beaver trail in snow. Near Slate River above Crested Butte, 



Gunnison County, Colorado, Oct. 20, 1905 205 



Figure 55. Willow brush in beaver pond, cut and stored by beaver. Near 



Crested Butte Colorado 206 



Figure 56. A beaver dam near Brush Creek, Gunnison County, Colorado, 

 showing pine logs projecting above the dam. An unusual 

 occurrence 206 



Figure 57. Dam in which willow brush was largely used in construction, and 

 with which the face is covered. A good example of this type. 

 Monument Creek, El Paso, Colorado 209 



Figure 58. Section of beaver dam showing underpinning of sticks laid cross- 

 wise to the current. Near Crested Butte, Colorado 209 



Figure 59. Series of three beaver dams placed so as to form deep, quiet pools 

 by the bank of the stream; on Slate River, Gunnison County, 

 Colorado 210 



Figure 60. Diversion dam on Carnelian Creek, turning part of the stream 



onto the bank to supply ponds there 210 



Figure 61. The big lodge adjacent to Tower Creek, in midst of heavy 

 Engelmann spruce forest. Diameter 24 feet; height 7 feet, 



3 inches above the water 213 



Figure 62. Beaver house cut open, showing chamber and entrance. Near 



Crested Butte, Gunnison County, Colorado, Sept. 5, 1902. . . . 213 

 Figure 63. Bank lodge on Carnelian Creek. Doubtless during high water 



in spring this would be flooded and untenable 214 



Figure 64. Lodge in one of the ponds along Cooke City road. An example 



of a house lodge built against the bank. Occupied by at least 



eight beavers 214 



Figure 65. Upper water level on two-level canal at works adjacent to Tower 



Creek. The dam is under the log in the foreground 217 



Figure 66. Lower water level connecting with pond, and earth slide or chute 



from dam. On two-level canal at works adjacent to Tower 



Creek 217 



Figure 67. Canal and mud banks half a mile above group of ponds at the 



big spring by Tower Creek 218 



Figure 68. Mud " sign heap " in upper Lost Creek; about a foot in diameter 



and four inches thick. The beavers deposit their castoreum on 



these piles perhaps as a means of communication 218 



Figure 69. Beaver swimming. Photographed at the large pond at Crescent 



Hill; about noon July 22, 192 1 220 



Figure 70. Beaver crossing a dam. Photographed from beside the Cooke 



City road near Yellowstone River bridge in mid-afternoon. . . 220 



