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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 American water shrew or northern water shrew (Sorex palustris) is a shrew found in the nearctic faunal region located throughout the mountain ranges of the northern United States and in Canada and Alaska. [3] The organism resides in semi-aquatic habitats, [4] and is known for being the smallest mammalian diver. [5]
The American pygmy shrew is the smallest mammal native to North America and is one of the smallest mammals in the world, just slightly larger than the Etruscan shrew of Eurasia. Its body is about 5 cm (2 in) long including a 2-cm-long tail, and it weighs about 2.0 to 4.5 g (0.07 to 0.16 oz). [9]
The North American least shrew will also sometimes live inside beehives and eat all the larvae. It will often share its food with other shrews. It eats more than its body weight each day and is known to store food. [4] [7] The North American least shrew makes its home in burrows or shallow runways under flat stones or fallen logs.
The cinereus shrew or masked shrew (Sorex cinereus) is a small shrew found in Alaska, Canada, and the northern United States. [2] This is the most widely distributed shrew in North America, where it is also known as the common shrew .
The long-tailed shrew has an unusually limited geographic range. The species can be found in the Appalachian Mountains, Nova Scotia, and Southeastern New Brunswick, from Canada southward along the mountains to North Carolina, and small ranges of the species in Tennessee. In New York, the long-tailed shrew is found in the Adirondacks and Catskills.
The smoky shrew (Sorex fumeus) is a medium-sized North American shrew found in eastern Canada and the northeastern United States and extends further south along the Appalachian Mountains. U.S. Forest Service image
Although the marsh shrew and the American water shrew (the two largest shrews in North America) share some features, [4] the American water shrew has more dark-grey-to-black fur on its back, a silver-grey belly and a bi-colored tail [3] and the marsh shrew's fringed hairs are more distinct. [4]