rice rat

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various rats of the tribe Oryzomyini of tropical and subtropical North, Central, and South America, especially Oryzomys palustris, a wetland species that feeds on grasses and seeds, including cultivated rice.

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

• noun a rat, Oryzomys palustris, found in rice fields and grassy marshes of Mexico and the southern United States

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

• noun hardy agile rat of grassy marshes of Mexico and the southeastern United States