This shrew, also called the dusky shrew, was lumped together with the vagrant shrew for decades under one broad species idea, so range and habitat still matter more than looks when telling the two apart in the field. All 280 Idaho records come from GBIF, not iNaturalist, typical for a species biologists usually confirm with skull measurements and genetics rather than a photo.
Sightings build through late spring to a July peak of 98, tapering fast by fall and vanishing in the record from October through April. Unlike a hibernator, this shrew stays active year-round on a nonstop hunting schedule, so the empty winter months almost certainly reflect when trapping surveys run rather than when shrews are actually out and about.
It turns up in damp conifer forest and streamside cover from valley floors to high mountain slopes near places like Deer Flat and Camas National Wildlife Refuges, tracking moisture and canopy shade more than any single elevation band.
Full species profile
