Wild Animals of the Rockies / With a List of Mammals found in Rocky Mountain National Park
James P. Gilligan
LONG-TAILED VOLE (Microtus longicaudaus mordax)
MEADOW VOLE (Microtus pennsylvanicus modestus)
DWARF VOLE (Microtus montanus fusus)
Common on grassy hillsides and drier meadows.