The beach vole (Microtus breweri) is a species of rodent in the family Cricetidae. It is found only in the United States, and its natural habitat is temperate grassland.Muskeget Island, between Nantucket, Massachusetts and Marthas Vineyard is the only known home of the beach vole, also known as the Muskeget vole. There is a question whether the Muskeget vole is a unique species or a subspecies of the meadow vole (M. pennsylvanicus). This vole may soon be listed as an endangered species.