Table 17 continued. 



Breeding Breeding 



Species Status Species Status 



101. Grasshopper sparrow b 106. Chipping sparrow B 



102. Vesper sparrow B 107. Clay-colored sparrow b 



103. Lark sparrow B 108. Brewer's sparrow b 



104. Dark-eyed junco b 109. Field sparrow b 



105. Tree sparrow W 110, White-crowned sparrow M 



]^/ Breeding status 



B - Hard evidence of breeding 



b - Circumstantial evidence of breeding 



t - Occurs, but no evidence of breeding 



W - Overwintering observations 



M - Migratory observation 



most abundant species on the riparian census strip. The riparian 

 census strip supported the highest number of species and breeding 

 bird density, followed by the ponderosa pine census strip. The 

 sagebrush census strip supported the lowest number of species 

 and breeding bird density, although the grassland census strip 

 supported densities nearly as low. The higher number of species 

 observed on the grassland strip than on the sagebrush strip was 

 probably due to greater proximity of the grassland census strip 

 to ponderosa pine habitat. 



Raptors 



Eleven species of hawks and three species of owls were observed 

 on the study area. Inconspicuous species such as screech owls 

 and saw-whet owls may also have occurred in the study area. 

 Goshawks were observed within ten miles of the study area, and 

 suitable nesting habitat for them was present in the study area. 

 This species may have been overlooked because of poor visibility 

 in the dense forests it prefers. 



Accipiters: Cooper's hawks were observed twice in the study area 

 in 1980 (Figure 17). One of the observations was during the 

 nesting season (June). One sharp-shinned hawk was observed on 

 1 June 1980. Both of these species probably nested in the 

 study area. 



37 



