There are 62 species in the genus Microtus in the world with 23 vole species in the United States. The most common in North America is the meadow vole, Microtus pennsylvanicus. Although sometimes referred to as a “meadow mouse” they are a separate and distinct animal from any mice species found in North America. There are three (3) species of voles that are arboreal and spend their time both above ground, in the trees, and foraging on ground level, too!