Richardson 1937 Month 20-mile Creek, 9 mi. S. of Lake O., Oregon. May 29, 1937 - The day was again spent (5-9 A.M.) in the flat area of high sagebrush with occasional thickets of willows gooseberry (?) and wild rose (?). These thickets are a distinct habitat in themselves; for example the yellowthroats are typically confined to them as are the Song Sparrows, Chats, and several warblers. The willow thickets are usually associated with running water while the other thickets may seem to be purely "islands" in the general sagebrush habitat. The abundance of birds in the whole region of 20-mile C. may be explained on the basis of number of habitats. Mountains, canyon and valley with varying soil and water conditions, combine to make a large number of habitats possible. The effect of altitude (probably around 4,000') is problematical here and must be considered in the light of other climate factors. Additions to Birds Identified (see p. 3 etc.) Common Teal Caspian Tern Great Blue Heron Sage Thrasher