water shrew

:  any of numerous semiaquatic shrews usually living adjacent to swift-flowing streams and having hind feet that are typically fringed with long stiff hairs and are sometimes partially webbed: such as a :  a widely distributed Old World shrew (Neomys fodiens) b :  any of several shrews (genus Chimarrogale) of Japan, Borneo, and Sumatra c :  any of several web-footed shrews (genus Nectogale) of Tibetan uplands d :  a common North American shrew (Sorex palustris)