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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).
Shrews have unusually high metabolic rates, above that expected in comparable small mammals. [4] For this reason, they need to eat almost constantly like moles. Shrews in captivity can eat 1 ⁄ 2 to 2 times their own body weight in food daily. [5] They do not hibernate, but some species are capable of entering torpor.
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.
Shrews need to consume 200% to 300% of their body weight in food each day in order to survive; to achieve this they must eat every 2 to 3 hours, and they will starve if they go without food much longer than that. They do not hibernate because their bodies are too small to store sufficient fat reserves and they have a short fasting duration. [5] [7]
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
Marsh shrews are easily trapped in sunken cans, possibly due to their inability to see where the edges of surfaces drop. [21] In captivity they vocalize when they are displaced or scuffle with other animals in their cage, [14] twittering shrilly if disturbed while eating or in a confrontation over food (such as a worm). [22]
The northern short-tailed shrew (Blarina brevicauda) is the largest shrew in the genus Blarina, [3] and occurs in the northeastern region of North America. [4] It is a semifossorial, highly active, and voracious insectivore and is present in a variety of habitats like broadleaved and pine forests among shrubs and hedges as well as grassy river banks. [5]
The Asiatic water shrews are the members of the genus Chimarrogale. They are mammals in the subfamily Soricinae of the family Soricidae. [1] They are aquatic, with some species inhabiting streams. [2] The genus contains the following species: Malayan water shrew (Chimarrogale hantu) Himalayan water shrew (Chimarrogale himalayica)