Inyo shrew

Sorex tenellus

LCLeast Concern

The Inyo shrew is a tiny, long-snouted hunter known from scattered wet places in the desert mountains of eastern California and Nevada. It survives where springs, seeps, and stream margins keep insects and cover available within an otherwise dry landscape. Few records exist, but that scarcity reflects both its narrow habitat and the difficulty of finding shrews, not a population count.

US Range

Occurrence data: GBIF (85 georeferenced US records, 2000-2026). Darker shading marks states with more recorded observations.

Explore by state

Inyo shrew across 2 states

Occurrence records, conservation status, and the places it turns up, state by state. Open a state for detail, or visit its full page.

  • NevadaNativeOccasional48 records

    State rankImperiled

    Notable placesGreat Basin National Park

    Countiesrecorded in 7

    Year-round in Nevada, with recorded sightings peaking in August.

  • CaliforniaNativeRare37 records

    State rankUnranked

    Notable placesInyo Mountains Wilderness Area · Kings Canyon National Park · Lassen Volcanic National Park · White Mountains Wilderness

    Countiesrecorded in 6

    Year-round in California, with recorded sightings peaking in July.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

SizeInyo shrew beside a 1.8 m adult, drawn to scale
Created by potrace 1.16, written by Peter Selinger 2001-2019 Created by potrace 1.16, written by Peter Selinger 2001-2019
Body length
6–6 cm2 in–2 in
Weight
3–4 g0.1–0.1 oz

Silhouettes drawn to scale against a 1.8 m5 ft 11 in adult.

Elevation

From 85 georeferenced records, the Inyo shrew is recorded from 981 m3,219 ft to 4,295 m14,091 ft, with half of sightings below 2,989 m9,806 ft.

Each band shows the share of georeferenced sightings that fall within it. Records cluster where people live and hike, so low, populated elevations are over-represented. Read this as observation density, not true abundance.

Best encounter

Where and when to see an Inyo shrew

Your best chance: Nevada.

Where
NevadaNV

Life history

The Inyo shrew (3–4 g0.1 oz) is a carnivore.

Diet composition

Carnivore

By foraging composition: 70% invertebrates, 30% scavenged.

  • Invertebrates70%
  • Scavenged30%

Most active around the clock.

Typical values for the species, not local measurements.

Commonly confused with

Animals people sometimes mistake for the inyo shrew, and how to tell them apart.

A small hunter with a pointed face

A pointed snout, minute eyes, and a body shaped for moving through wet litter identify this as a shrew rather than a mouse. It searches constantly for insects and other small prey. Close shrew species can look much alike, so geography and detailed examination matter more than a quick view.

Islands of moisture in desert mountains

Known sites lie around springs, marshy edges, and small streams in the Inyo region and nearby Nevada ranges. These wet pockets are separated by broad dry valleys. A missing dot between them doesn’t prove absence because trapping effort is uneven. Each spring can still matter greatly when usable habitat is naturally so limited.

A fast life close to cover

Shrews burn energy quickly and must feed often. Damp soil and plant litter support their prey while shielding them from heat and drying. They don’t hibernate through the hard season. Owls, snakes, and small mammal hunters take them, making dense low cover valuable during almost constant searching.

Water changes can erase a site

Groundwater pumping, spring diversion, grazing pressure, and drought can shrink wet habitat. Fire may remove cover around a seep even when water remains. The species is listed as Least Concern globally, but its scattered distribution deserves local attention. Protecting spring flow and vegetation safeguards far more than this one small mammal.

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • PhyloPicCC0 / CC-BY per itemthe to-scale silhouettesBecky Barnes (Sorex) · Andrew A. Farke (human silhouette, CC-BY 3.0)
  • AnAge (HAGR)CC-BY 3.0longevity, maturity, and gestation figures
  • IUCN Red Listattributed factthe global conservation status
  • Amniote Life-History DatabaseCC0 · public domainreproduction figures
  • EltonTraitsCC0 · public domaindiet and foraging-activity data