FIGURE PAGE 



34. Head of Sierra White-tailed Jack Rabbit 225 



35. Heads of Mariposa Brush Rabbit and Sacramento Cottontail Rabbit 229 



36. Skulls and horns of Sierra Nevada Mountain Sheep and Domestic Sheep 245 



37. Harlequin Ducks 255 



38. Debris from beneath Cooper Hawk's nest 285 



39. Owls of the Yosemite region 299 



40. Debris from beneath Long-eared Owl's nest 303 



41. Work of Willow Woodpecker on apple tree 319 



42. Feet of Northern White-headed Woodpecker and Arctic Three-toed Woodpecker 326 



43. Diagram of workings of Sierra Red-breasted Sapsucker 328 



44. Fresh work of Williamson Sapsucker 332 



45. Scars on trunk of lodgepole pine, result of work of Williamson Sapsucker 333 



46. Head of Northern Pileated Woodpecker 335 



47. Head and tongue of California Woodpecker 339 



48. Drillings of California Woodpecker and nest site of Lewis Woodpecker 340 



49. Head of Clark Nutcracker 395 



50. Tails of California Purple Finch and California Linnet 421 



51. Bill of Sierra Crossbill and cone and seeds of lodgepole pine 430 



52. Bills of Cassin Purple Finch, California Evening Grosbeak, and Sierra Nevada 



Rosy Finch 431 



53. Tails of Willow, Green-backed, and Lawrence goldfinches, and Pine Siskin 436 



54. Tails of Western Lark Sparrow and Western Vesper Sparrow 444 



55. Young of Mariposa Fox Sparrow and Pacific Black-headed Grosbeak 489 



56. Forage niches of warblers in Yosemite Valley 517 



57. Tails of Alaska Myrtle Warbler and Audubon Warbler 527 



58. Tails of Sierra Creeper and Red-breasted Nuthatch 562 



59. Heads of Sierra Hermit Thrush and Cassin Purple Finch 604 



60. Young Western Robin 607 



61. Zonal distribution of certain reptiles and amphibians 627 



62. Western Yellow-bellied Racer and Giant Garter Snake 637 



63. Boyle King Snake and California Striped Racer 641 



64. Rattle of Pacific Rattlesnake 647 



65. Poi.son apparatus of Pacific Rattlesnake 649 



