California mammals

Western Small-footed Myotis in California

Myotis ciliolabrum

Native to California S3 Vulnerable in California

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

Western Small-footed Myotis in California, by the numbers

Occasional in California 154th most recorded of 241 mammals logged in California

253 occurrence records
12 with iNaturalist photos

Records from 2000–2026.

When to look for the Western Small-footed Myotis in California

Most sightings fall in June.

253 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
January6
February11
March6
April14
May31
June60
July32
August29
September42
October15
November4
December3

Monthly western small-footed myotis occurrence records (iNaturalist and GBIF) in California, 2000–2026.

Seasonality

Year-round in California, with recorded sightings peaking in June, with a smaller rise in September.

Occurrence map

Where Western Small-footed Myotis has been recorded in California

253 records mapped · zoom and drag to explore

253 California records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Mojave National Preserve 12
Angeles National Forest 6
Santa Rosa And San Jacinto National Monument 5
Pinnacles National Park 1
Cleveland National Forest 1
White Mountains Wilderness 1
Cuyamaca Rancho State Park 1
Carrizo Plain National Monument 1

Protected places with the most western small-footed myotis 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 Bernardino County 76
San Diego County 50
San Luis Obispo County 45
Riverside County 13
Kern County 13
Lassen County 12
Mono County 7
Inyo County 7
San Benito County 4
Plumas County 4
Nevada County 3
Los Angeles County 3
13 other counties 16

The complete county distribution, spread across 25 California counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Western small-footed myotis is one of the smallest bats in the West, tucking into cracks in canyon walls and badlands rather than open habitat, so most sightings come from bat surveys and museum specimens instead of casual photos. Only 12 of California’s 253 records came through iNaturalist; the rest are GBIF entries, a split that fits a bat too small and too nocturnal for most people to notice, let alone photograph.

Refuges like Salton Sea, Klamath Basin, and Don Edwards near San Francisco Bay show up in the records less because they match the species’ rocky, dry-country roosting habits and more because open water at those sites draws insects, and insects draw foraging bats after dark.

June carries the clearest peak in the monthly count, with 60 records, which likely tracks when survey crews are out with mist nets rather than a summer population surge. California lists the species as S3, vulnerable at the state level, worth noting given how thin the record trail already is.

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
  • NatureServe ExplorerCC-BYthe state conservation rank
  • 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"