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American water shrew
The American water shrew (''Sorex palustris'') or northern water shrew, is found in the nearctic faunal region located throughout the mountain ranges of northern United States and in Canada and Alaska.
== Description ==
The American Water Shrew is considered a species that is sexual dimorphic in which the males are in general bigger and heavier than the females. The size of the shrew can be anywhere from 130–170 mm and weigh from 8-18 grams. Their tails range from 57–89 mm. The shrew contains black and brown fur colors and changes depending on the season. The color will change to lighter brown in the summer and a black color in the winter. Air bubbles are trapped in the thick fur when the animal dives underwater. The air bubbles help the shrew with buoyancy and also allow it to engage in a behavior called “water-walking”. The water shrew can dive underwater for about 15 seconds, but is only able to if it is swimming vigorously. The air bubbles allow the shrew to swim, but as soon as the shrew stops swimming, then it will shoot back up to the surface. Its feet have a fringe of hairs, more visible on the larger hind feet, which allow this animal to run on the water's surface.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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