Table 5. (continued) 



Average number known present per trip 

 Mar .- 

 Species Jan. Apr. June Aug. 



Swainson's Thrush - 0.3 5.7 - 



Veery - - - 1 .0 



Mountain Bluebird - 



Townsend's Solitaire - 



Cedar Waxwing - 



Red-eyed Vi reo - 



Yellow Warbler - 



Yel low-rumped Warbler - 



MacGi I li vray ' s Warbler - 



American Redstart - 



Unidentified Warbler - 



Brown-headed Cowbird - 



Pine Grosbeak - 



Pine Siskin 



Dark-eyed Junco - 



Song Sparrow - 



Unidentified Sparrow 



Unidentified Passerine 0.7 



MAMMALS 



Unidentified Chipmunk 



Tree Squi rrel 1 .7 



Bighorn Sheep - 



Unidentified small mammal - 



White-tailed Deer - - 1.0 



Seasonal variation in numbers of species encountered during project area censuses 

 each month is shown in figure 1. Study data show that the number of water-related bi r 

 species (waterfowl, shorebirds, herons, gulls, ospreys, bald eagles, dippers, belted 

 kingfishers) remains relatively constant year round, with a slight increase during the 

 breeding season. The number of species of other birds, although relatively high 

 throughout the year, increases considerably during the breeding season. 



Census results for the dipper are shown in figure 2, and variations in average 

 monthly abundance of the most common waterfowl species, as determined by the censuses, 

 are portrayed in figure 3. 



- 20 - 



