tracks east of the switching station below the power line crossing. 

 These squirrels appeared to prefer the more open habitat next to the 

 railroad tracks. 



Winter Bird Survey and Breeding Bird Census 



Fourteen species were encountered during the 1978 winter bird 

 survey on 8 counts averaging 107 minutes each, as follows (numbers in 

 parentheses indicate average number seen per trip (+ = less than 0.5) , 

 indicated density per 100 ha, and indicated density per 100 acres): 

 Mallard (2, 5, 2), Common Goldeneye (10, 22, 9), Common Merganser (+, +, 

 +), Mourning Dove (+, +, +), Belted Kingfisher (+, +, +) Pileated 

 Woodpecker (+, +, +), Hairy Woodpecker (+, +, +), Common Raven (+, +, 

 +), Common Crow (1,1, +), Black-capped Chickadee (4, 9, 4), Brown 

 Creeper (+, +, +), Dipper (6, 13, 6), Golden- crowned Kinglet (5, 12, 5), 

 and Song Sparrow (1 , 1 , 1). 



Results of th:^ 1978 breeding bird census are (."resented in Appendix D 

 and summarized in Table 8. A total of 33 breeding species were encountered 

 on the plot, with a total of 91 territorial males or females. The 

 overall density of birds for the plot, including the water area, was 

 found to be 410 individuals/km2 (166/100 acres); for the land are alone, 

 density was 684/km2 (278/100 acres) (each territory was assumed to represent 

 two individuals). These latter figures are within the range reported by 

 Beidleman (1978) for cottonwood-willow communities in Colorado, but are 

 somewhat lower than typical densities of eastern deciduous woodland. Rocky 

 Mountain coniferous forest, and floodplain forests (Beidleman 1978, 

 Fitzgerald 1978). 



Small Mammal Trapping 



A summary of small mammal trapping data is presented in Table 9. 

 Eight species of mammals were captured during the trapping program; a 

 song sparrow was also taken in a snap trap. Snap trap data indicated 

 that the tota> number of captures, total number of species, and total 

 biomass of captures were lower in the riparian grassland than in adja- 

 cent coniferous forest. A large percentage of all captures and biomass 

 in the coniferous forest were of deer mice, which were not taken in 

 riparian grassland. Voles of the genus Microtus and meadow jumping mice 

 were taken only in riparian grassland, while the masked shrew, red- 

 tailed chipmunk, and red-backed vole were taken only in conifers during 

 the snap trapping program. 



Furbearer Harvest Data 



Trapping of furbearers is a locally important type of recreation 

 and also contributes to the local economy. MDFWP estimates of fur 

 harvest by licensed trappers in Hunting District lOO, which includes the 



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