A red-backed vole of Pacific Northwest conifer forests
The reddish-chestnut stripe running down its back gives this vole its name and its best field mark, set against grayish sides and a short tail. It belongs to the same genus as the northern red-backed vole, and some references still use the older name Clethrionomys rather than the current Myodes. Either way, it’s a small, short-legged forest-floor forager built for tunneling through leaf litter and rotting wood. Its tail is noticeably shorter than in most other voles sharing its range, another small but useful clue.
A narrow range tucked into two states
Every confirmed record sits in southern Oregon or the far north of California, a slice of the Pacific Northwest’s conifer belt. Elevation records run from river-bottom forest up past 6,200 feet in the mountains, with half of all sightings between about 1,000 and 2,600 feet. Reported sightings cluster in the warmer months from June through September, when field surveys and casual observers are most likely to be out in these forests. Because its range sits in remote, rugged conifer country straddling two states, the western red-backed vole is under-recorded compared with voles of more accessible lowland habitat, and sparse survey coverage, rather than genuine rarity, likely explains why confirmed sightings remain so few.
Diet, forest ecology, and conservation status
Red-backed voles are best known among biologists for eating fungi alongside green plants and insects, a habit that lets them disperse the spores of underground fungi conifer roots depend on to take up water and nutrients. In that sense, this small vole does outsized work for the health of the forest around it. Gestation runs a brisk 18 days, quick even by rodent standards, letting females fit in several litters across a single summer. The IUCN lists the species as Least Concern, though that doesn’t make it immune to logging pressure across its narrow, forest-dependent range.
