. Brigham Young University science bulletin. Biology -- Periodicals. Birds of the Upper Colorado River Basin 13 Sparrow, and Green-tailed Towhee. The Vesper Sparrow is particularly characteristic of the sagebrush communities of Wyoming and Colo- rado while the Black-throated Sparrow is the most conspicuous species in the warmer south- ern portions of the basin. The Sage Thrasher is very characteristic over the entire upper basin and the Mocking- bird is found rather commonly especially in greasewood and tall sage communities of the southern part. The Common Nighthawk and the Poor-will nest usu
. Brigham Young University science bulletin. Biology -- Periodicals. Birds of the Upper Colorado River Basin 13 Sparrow, and Green-tailed Towhee. The Vesper Sparrow is particularly characteristic of the sagebrush communities of Wyoming and Colo- rado while the Black-throated Sparrow is the most conspicuous species in the warmer south- ern portions of the basin. The Sage Thrasher is very characteristic over the entire upper basin and the Mocking- bird is found rather commonly especially in greasewood and tall sage communities of the southern part. The Common Nighthawk and the Poor-will nest usually on low exposed ridges, but the former species may roost in trees. Bur- rowing Owls occur especially in prairie dog towns or where there is an abundance of ground squirrels. Say's Phoebe is frequently seen in desert shrub communities where it perches on the taller shrubs, but there are usually old build- ings or rocky ledges available to serve as nest- ing sites. The Loggerhead Shrike is another characteristic species of the desert shrub com- munities. Possibly the most widespread and common bird of the desert shrub is the Homed Lark. This species is often seen in large flocks most of the year, especially along roadways and in more open country where the shrubs are lower in growth form and more scattered. In winter Horned Larks appear in immense flocks where food is exposed and such flocks may also contain a few other species including the Lapland Long- spur and Snow Bunting. Flocks of Juncos and White-crowned Sparrows also appear in the desert shrub during the winter. The sheer cliffs, rock piles, and spires so characteristic of the canyon lands country of the Colorado Plateau afford nesting and lookout sites for a unique group of birds. Several of the hawks that occur in the area may use the cliffs and spires for such purposes. These in- clude the Golden and Bald Eagles, Red-tailed Hawk, Rough-legged Hawk, Prairie Falcon, and Sparrow Hawk. The Raven is another common spec
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