This shrew is found west of the crest of the Cascade Range in Washington and Oregon, and has been collected in the park at Ohanapecosh (2,000 feet), Tahoma Creek (2,500 feet), and Longmire (2,700 feet). It prefers dark woods and moist situations.
The navigator water shrew, Sorex palustris navigator (Baird), is a large shrew about the size of a house mouse, with small fore feet and broad hind feet. Its coloration above is dark brown or blackish with some of the hairs whitish tipped, the underparts are whitish-gray. The tail is brown above and pale gray below.
This species is found from the Rocky Mountains and the outlying ranges of British Columbia to southern Colorado, and in California as far south as Sequoia-Kings Canyon National Park. It is commonly encountered from the lowest elevations in the park up to around 8,000 feet, and is usually found along stream banks and at lake outlets.
The Bendire water shrew, Sorex bendirii bendirii (Merriam) is about the size of a house mouse, a sooty-gray color above and slightly paler below.
It is found in the Klamath section of Oregon, a narrow strip along the coast of California, and in the Cascades from Washington to British Columbia. It has been recorded at elevations ranging from 2,000 to 4,000 feet on the west and south sides of the park. Like all water shrews it prefers moist areas and is usually found around wet meadows or in the forest cover near lowland creeks.
Specimens in park collection: Wandering shrew, RNP-89; Olympic dusky shrew, RNP-55, RNP-88; cinereous shrew, none; Trowbridge shrew, RNP-61; navigator water shrew, RNP-64, RNP-83, RNP-90; Bendire water shrew, RNP-1, RNP-56, RNP-72; Longmire Museum, Park Headquarters.
Because of their secretiveness and tiny size the shrews are seldom observed, although they are relatively abundant in the park. By stationing oneself in an elevated spot near a grassy stream bank or in a damp, shady, forested area it is sometimes possible to observe the actions of these small creatures. While their diet is largely composed of insects, they do eat such things as worms, as well as small birds and mammals that they can kill. They are very nervous animals and extremely courageous hunters, and will attack and kill other mammals much larger in size. They require an abundance of food to live and will die if deprived of food for even a few hours. This might lead one to suppose that they are somewhat weak, but such is not the case. They are active throughout the year, being seen abroad under even the most rigorous climatic conditions.
THE BATS
Of the four types of bats known to occur in the park, only two are closely related. These two are very small as compared to their larger cousins.
The Miller bat, Myotis yumanensis saturatus Miller, is a small bat with the upperparts dark glossy yellowish brown and the underparts golden. The sides, chin and throat are somewhat darker than the underparts. The fur over the entire body is slaty black at the base. The membranes of the wings are blackish.