Description

"Townsend's Vole is one of the largest voles in North America, and it is also very abundant where it occurs, making the species highly significant to a multitude of predators, including herons, owls, and other birds of prey; and raccoons, skunks, weasels, mink, coyotes, bobcats, and red and gray foxes. Snakes, too, feed on these Voles. Densities as high as 800 Voles per hectare have been recorded, and when densities exceed 100, Townsend's Vole may exclude other small rodents from its range through competition. Townsend's Vole has dark-brownish fur and ears large enough to project above the fur. The ears are small by most standards but large for the genus: Microtus comes from two Greek words that mean ""small ear."""

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