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The warbling vireo and house wren were the two most common birds • <br />on both plots (Table 10). Other species that were common on one or <br />both aspen plots Included the western wood-pewee (Contoous <br />~; r <br />sordidulus), yellow-rumped warbler (Dendroica coronata), dark-eyed <br />junco (Junco hvemalis), and American robin (Table 10). <br />Five species were seen exclusively in aspen plots (Table T). The <br />yellow-rumped warbler, dark-eyed junco, and Swainson's thrush (Catha- <br />rus ustulatus) appeared to be particularly attracted to aspen and were <br />recorded every survey morning. The downy woodpecker (Picoides up be_ <br />scans) and Stellar's jay (Cvancocitta stelleri) were also exclusively <br />seen in aspen, but their occurrence on the plots was sporadic. <br />Sagebrush <br />Seven of the 15 species observed in sagebrush were seen in both <br />plots (Table 11). Five species were only observed on the north plot • <br />and three were only seen in the south plot. Most of the species that <br />only occurred in one plot were birds that were seen during just one or <br />two observation periods (Table 11). <br />Bird abundance recorded for both the sagebrush plots was very <br />similar. On the north plot a mean of 16.3 birds per day were ob- <br />served; on the south plot the daily mean was 15.3 birds. <br />The vesper sparrow (POcecetes gramineus) was the most common bird <br />on both plots (Table 11). Other species that were common on both <br />plots included the mountain bluebird (Scalia currucoides), green- <br />tailed towhee, and broad-tailed hummingbird. Species that were regu- <br />lar in at least one plot included mourning doves (Zenaida macroura), <br />chipping sparrows, European starlings (Sturnus vulgaris), brown-headed • <br />cowbirds (Molothrus ate r), and black-billed magpies (Pica Dice). <br />40 <br />