Description

Found only on Muskeget Island, the Beach Vole became isolated from its closest relative, the Meadow Vole, about 3,000 years ago during a glacial melt and rise in sea level. It is the only mammal endemic to Massachusetts, the result of genetic isolation from the mainland Meadow Vole. It differs from the Meadow Vole in having a lower rate of reproduction, smaller litter size, greater body weight, and longer life span. It differs from almost all other voles by maintaining relatively constant population densities; voles are well known for fluctuations in density. Beach grass provides the major food source and habitat for this rodent, which is also known as the Beach Mouse or the Beach Meadow Mouse.

Links:
Mammal Species of the World
Click here for The American Society of Mammalogists species account