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The American water shrew is a sexually dimorphic species in which the males are generally larger and heavier than the females. The size of the shrew is 130–170 mm (5.1–6.7 in) and weight is 8–18 g (0.28–0.63 oz).
The Eurasian water shrew (Neomys fodiens), known in the United Kingdom as the water shrew, is a relatively large shrew, up to 10 cm (4 in) long, with a tail up to three-quarters as long again. It has short, dark fur, often with a few white tufts, a white belly, and a few stiff hairs around the feet and tail.
They also eat plants. Compared to other shrews in the genus Sorex, Trowbridge's shrews eat more vegetable matter. [1] During winter months, they may feed on conifer seeds, such as Douglas-fir and pine, as well as other plant seeds. [12] Although some shrews are known to be strong swimmers, it is not clear if this is true for Trowbridge's shrew.
Water shrew may refer to any of several species of semiaquatic red-toothed shrews: Asiatic water shrews (Chimarrogale spp.) Malayan water shrew (C. hantu) Himalayan water shrew (C. himalayica) Sunda water shrew (C. phaeura) Japanese water shrew (C. platycephala) Chinese water shrew (C. styani) Sumatran water shrew (C. sumatrana) Nectogale
All shrews are tiny, most no larger than a mouse. The largest species is the Asian house shrew (Suncus murinus) of tropical Asia, which is about 15 cm (6 in) long and weighs around 100 g (3 + 1 ⁄ 2 oz) [2] The Etruscan shrew (Suncus etruscus), at about 3.5 cm (1 + 3 ⁄ 8 in) and 1.8 grams (28 grains), is the smallest known living terrestrial mammal.
The Glacier Bay water shrew (Sorex alaskanus) is a species of mammal in the family Soricidae. It is endemic to Alaska in the United States. [1] It can swim underwater, and when it stops swimming, air trapped in its fur lets it float back up to the surface. Owing to small hairs on its feet, the water shrew can run across the water.
The Japanese water shrew grows to a length of about 11 to 14 cm (4 to 6 in) long with a tail length of 8 to 12 cm (3 to 5 in) and weight of 25 to 63 grams (0.88 to 2.22 oz). The dense short fur on the head, back and sides is greyish-black. The underparts are dirty white and are sharply demarcated from the dorsal surface.
The Eurasian least shrew weighs only 1.2–4 g (0.042–0.141 oz) and has a body less than 4 cm (1.6 in) long, with a 2.5 cm (0.98 in) tail. It has a brown back and a light grey underside, with a fairly clear boundary in between. The color of the back varies seasonally from chocolate brown in summer to light brown in winter.