The creeping vole (Microtus oregoni), sometimes known as the Oregon meadow mouse, is a small rodent in the family Cricetidae.Ranging across the Pacific Northwest of North America, it is found in forests, grasslands, woodlands, and chaparral environments.The small-tailed, furry, brownish-gray mammal was first described in the scientific literature in 1839, from a specimen collected near the mouth of the Columbia River.[4] The type specimen was an older male collected November 2, 1836 near the mouth of the Columbia River in Oregon.[5] Creeping voles are found in British Columbia in Canada and in Washington, Oregon and northern California, in the United States.[1] They are found as far north as Port Moody, British Columbia and as far south as Mendocino City, California.[5] The western range in Washington extends east to Mount Aix, Lake Chelan, and Signal Peak.A models for the evolution of creeping vole sex chromosomes was published by researchers from the University of Edinburgh in 2001.[1] The justifications for the listing are the lack of major threats, the stability of populations, and the adaptability of the animal to environmental changes.[1] Treatment of Douglas-fir plantations with herbicides in British Columbia did not affect creeping vole populations.