vole Definition

any of various small rodents (Microtus and related genera) that typically have a stout body, rather blunt nose, and short ears, inhabit both moist meadows and dry uplands and do much damage to crops, and are closely related to muskrats and lemmings

grand slam

any of various voles (genus Microtus) that frequent open fields; especially : one (M. pennsylvanicus) that is widespread in North America —called also meadow mouse