Distribution of mammals in Colorado Distribution of mammals in Colorado distributionofma31972arms Year: 1972 1972 ARMSTRONG: COLORADAN MAMMALS 49 road) NE Silver Cliff, 8100 ft., 1 (KU); Westcliffe, 1 (USNM). Additional records: CLEAR CREEK COUNTY: above Silverplume, 9000 ft. (von Bloeker, 1944:312). EL PASO COUNTY: near Colorado Springs (War- ren, 1942:11). MONTEZUMA COUNTY: Mug House, Wetherill Mesa, Mesa Verde National Park (Hoffmeister, 1967:462). Sorex palustris Water Shrew Sorex palustris occurs near water through- out the mountains of the western three-fifths of Colorado. Extremes of
Distribution of mammals in Colorado Distribution of mammals in Colorado distributionofma31972arms Year: 1972 1972 ARMSTRONG: COLORADAN MAMMALS 49 road) NE Silver Cliff, 8100 ft., 1 (KU); Westcliffe, 1 (USNM). Additional records: CLEAR CREEK COUNTY: above Silverplume, 9000 ft. (von Bloeker, 1944:312). EL PASO COUNTY: near Colorado Springs (War- ren, 1942:11). MONTEZUMA COUNTY: Mug House, Wetherill Mesa, Mesa Verde National Park (Hoffmeister, 1967:462). Sorex palustris Water Shrew Sorex palustris occurs near water through- out the mountains of the western three-fifths of Colorado. Extremes of elevation of speci- mens examined are 6000 feet at Rifle Creek Hatchery, Garfield County, and 10,100 feet at St. Elmo, Chaffee County. The species no doubt occurs somewhat higher under suitable conditions. Water shrews are to be found most commonly along streams or ponds in dense spruce-fir forests, but may range down into open pine woodlands or even lower, given favorable microhabitat. These shrews are semi-aquatic and are excellent swimmers. No detailed study of the natural history of S. -palustris in Colorado has been made, but Spencer and Pettus (1966) compared habitat preferences of water shrews with those of four other species of long-tailed shrews in western Larimer County. Gordon (1931) discussed reproduction in the water shrew in Roulder County. Conaway (1952) reported on natural history of the species in Montana. Sorex palustris navigator (Baird) Neosorex navigator Baird, Mammals, in Reports of Explorations and Surveys . . . from the Mississippi River to the Pacific Ocean . . . , 8(1):11, 14 July 1858; type locality, near head of Yakima River, Cas- cade Mountains, Washington. Sorex (Neosorex) palustris navigator, Merriam, N. Amer. Fauna, 10:92, 31 December 1895. Distribution in Colorado.—Throughout the mountainous parts of the state in suitable habitat (Fig. 13). Measurements.—External and cranial measurements are presented in table 1. Remarks.—Long (1965:524) d
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