water shrew

from The Century Dictionary.

• noun An oar-footed aquatic shrew.

from the GNU version of the Collaborative International Dictionary of English.

• (Zoöl.) Any one of several species of shrews having fringed feet and capable of swimming actively. The two common European species (Crossopus fodiens, and Crossopus ciliatus) are the best known. The most common American water shrew, or marsh shrew (Neosorex palustris), is rarely seen, owing to its nocturnal habits.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of the small insectivores of the genus Neomys in the Soricidae family.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of several small semiaquatic shrews usually living near swift-flowing streams