12 ILLUSTRATIONS. 



Page. 



Plate XXIX. Young ferruginous rough-leg 148 



XXX. Young golden eagle 149 



XXXI. Belted kingfishers 156 



XXXII. Williamson sapsuckers 158 



XXXIII. Black-billed magpies 164 



XXXIV. Water ouzel's nest 188 



XXXV. Catbirds 190 



XXXVI. Northern varied thrush 197 



XXXVII. Map of life zone In pocket. 



Text Figures. 



THE MAMMALS. 



Fi<i. 1. Transition Zone on Big Prairie in North Fork Valley 20 



2. Head of 5-year-old ram from Chief Mountain 28 



3! A five-point bull elk in early winter 33 



4. Head of mule deer buck from Huckleberry Mountain 34 



5. Head of white-tail deer at Belton, Mont 35 



6. (I) Yellow-bellied chipmunk; (II) pale 13-lined ground squirrel; 



(III) mantled ground squirrel; all from museum skins 40 



7. Plan of underground den of Columbia ground squirrel 48 



8. Woodrat in his nest of moss and lichens in old cabin 56 



9. Woodrat nest on shelf in corner of cabin 57 



10. Cottonwood stump cut by beavers on Camas Creek 66 



11. Jumping mouse 70 



12. Pocket gopher of the genus Thomomys 71 



13. Northern white-tailed jack rabbit in March 78 



14. Two mountain lions that will kill no more game 80 



15. Mountain red fox in Wind River Mountains, Wyoming 84 



16. Mink photographed at old cal)in above Kintla Lake 86 



17. (I) Dusky shrew; (II) masked shrew; photographed from alcoholic 



specimens 99 



18. (I) Brown bat; (II) long-legged bat; museum specimens 100 



THE BIRDS. 



19. Western grebe Ill 



20. Horned grebe 112 



21. Red-breasted merganser 117 



22. Hooded merganser 116 



23. Baldpate 118 



24. Green- wdnged teal 119 



25. Blue-mnged teal 120 



26. Cinnamon teal 120 



27. Pintail 120 



28. Canvas-back 121 



29. Scaup duck 121 



30. Golden-eyes on Yellowstone Lake 122 



31 . Buffle-head 124 



32. Western harlecjuin duck - - 124 



33. Harlequin duck at Iceberg Lake 126 



34. White-winged scoter 127 



35. Ruddy duck 127 



36. Canada geese 128 



37. Bittern 130 



38. Young great blue heron 130 



39. Avocet 132 



40. Wilson snipe 133 



41. Killdeer '. 134 



