California mammals

Crawford's Gray Shrew in California

Notiosorex crawfordi

Native to California

Not listed as nonindigenous in California by USGS NAS; treated as native to its mapped California range.

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.

Crawford's Gray Shrew in California, by the numbers

Occasional in California 109th most recorded of 241 mammals logged in California

509 occurrence records
14 with iNaturalist photos

Records from 2000–2026.

509 total records count every California occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 492 records with a full observation date.

When to look for the Crawford's Gray Shrew in California

Most sightings fall in January.

492 California occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly California records (table)
MonthRecords
January65
February25
March23
April42
May58
June55
July25
August36
September54
October53
November36
December20

Monthly crawford's gray shrew occurrence records (iNaturalist and GBIF) in California, 2000–2026.

Seasonality

Year-round in California, with recorded sightings peaking in January, with a smaller rise in April–June and September–October.

Occurrence map

Where Crawford's Gray Shrew has been recorded in California

300 records mapped · zoom and drag to explore

300 California records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Death Valley National Park 25
Cabrillo National Monument 7
Hollenbeck Canyon Wildlife Area 4
San Gorgonio Wilderness 4
Otay Mountain Wilderness Area 2
Santa Monica Mountains National Recreation Area 1
Mojave National Preserve 1
San Jacinto Wilderness 1

Protected places with the most crawford's gray shrew sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in California

CountyRecords
San Diego County 245
Orange County 63
Inyo County 59
Riverside County 53
San Bernardino County 30
Los Angeles County 22
Ventura County 16
Fresno County 12
Imperial County 5
Santa Barbara County 2
Other localities 2

The complete county distribution, spread across 10 California counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Crawford’s gray shrew records in California are almost entirely museum and survey specimens, 508 of 509 total, with just 14 ever logged through iNaturalist. A shrew this small and fast-moving, active mostly at night in desert scrub, is far more likely to turn up in a trap line than in front of a camera.

Reports show two separate rises across the year, one in January and another spanning September into October, rather than one clean summer peak. That two-part shape more likely reflects when trapping surveys ran in the Mojave and Colorado deserts than any real double breeding season for the shrew itself.

No NatureServe state rank has been assigned to this species in California, so its conservation status here is effectively undocumented rather than confirmed secure. With 509 total records, it sits in the middle of the pack among California mammals, common enough to be regularly picked up by desert small-mammal surveys but rarely seen firsthand.

Occurrence data from iNaturalist and GBIF.

More mammals in California in the atlas

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
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"