LIST OF ILLUSTRATIONS 
PmHtEeHnWe POUNC DAVEE. sce. .ic.c estes asec ce bees swe ees frontispiece 
ReNUPMIDC AVEE IO Udall aie. Seer eels ceed wishin cre Cale 6 wouie ei geieve teks 3 
Fig. 2. Beaver swimming, showing conspicuous ears..............-- 3 
eos ide view Ol. DeAver Ss SKUlN.9. 6.225 22 ons os ob. 3 Sa oe eee 4 
Fig. 4. Side view of beaver’s skull, with incisor teeth placed on 
ISIC Senter ieee Per gst acetsId A coe apes 3d.a ous eee 4 
ies <o.-Hand foot of beaver. «=... ... +. Wie Males 9 
Hie Keleton Of Plant DCAVET. 2 tics deelecte 2 oF os died AG ble wee oe 0lg oles 9 
Fig. 7. Map of North America showing distribution of beaver and of 
the aspen. ea ede NaS ata Noe INE ee at See 18 
Fig. 8. Lower side of Abe built of willows. : ool 
Fig. 9. Beaver dam which had been cut fieouen to fee ‘the ent 31 
Hoeeoebam with lone poles on the face... <2 5.0.6. acs. 2 eee ee eee 32 
Fig. 11. Map of dams deflecting current bak to the side of the stream 
waeresthecwater Was GECPest.... <0. . .dee Mi oss eee ee Pee 36 
Haeealeerel tes series of Three: GAMS 2. soe bons eo ea vole vaca scien 37 
Bicelsa As Gam with two sharp angles .:.005. <..sccs yccaeecce ce sears os 37 
Fig. 14. A long, crooked dam on the North Fork of Elk Creek, Yellow- 
OTN ALT Rates Moore ed tceavsdae rises § ees at Sikse ea als hb taste 2 ie eiiets « aiaimtauette 38 
Fig. 15. Map showing two dams with many angles in them, North Fork 
Ay amb see DEC ers ee ny Se NR cee asst Wy havas hveah chal way eta sak opae sete 39 
Fig. 16. Map of ponds on the North Fork of Elk Creek, Yellowstone 
Park, showing the changes which were made in two years.. 40 
Fig. 17. A dam which covered an arc of 225 degrees. . 42 
Fig. 18. The diversion dam on Carnelian Creek.... Pre ee eT: 
Fig. 19. The ponds on Lost Creek, before draining.................. 47 
Fig. 20. The ponds on Lost Creek, after draining.................. 48 
Fig. 21. Beaver work in the Town of Manitou..................0006 53 
fies 22. beaver dam under a railroad, bridge. 2)... 2..+2.5:252.. 20% a 53 
Hiss bond with conifers killed by flooding... /)...) 0.2 eases 00 54 
Fig. 24. Pond with alders, etc., killed by flooding... 54 
Fig. 25. Pond with willows, etc., killed by flooding. . Be ime | #5,°) 
ice beeAL Ty pICal, DeAVEL NOUSC 2. ve: den caps cide - 5 5 ods ce ole aed cewes 59 
face) interior of the lodge on Lost.Creek. «3.5.0... 025... see nee es 60 
Fig. 28. Drained pond on Lost Creek, showing the lodge............. 60 
igw2o. Hloor plan of the lodge on Gosh Creek:....-........0:5<.e0% 62 
Fig. 30. Plan of the large lodge near the Petrified Tree road........ 64 
Fig. 31. Open cut into the lodge on the Petrified Tree road......... 67 
Fig. 32. A lodge in Colorado before cutting open................... 68 
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