Nevada mammals

Western Little Brown Myotis in Nevada

Myotis lucifugus

Native to Nevada S2 Imperiled in Nevada

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

IUCN Red List status

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

EN – Endangered

Very high risk of extinction in the wild.

Little brown myotis roosting alertly on a wooden beamLittle brown myotis roosting in the corner of an attic beamLittle brown myotis roosting on painted wood sidingLittle brown myotis resting among blue spruce branches
Photo: Steph Brulot-Sawchyn · CC0Little brown myotis roosting alertly on a wooden beamPhoto: LeeAnn Latremouille · CC BY 4.0Little brown myotis roosting in the corner of an attic beamPhoto: Tom Romeo · CC BY 4.0Little brown myotis roosting on painted wood sidingPhoto: Patrick Jackson · CC BY 4.0Little brown myotis resting among blue spruce branches

Western Little Brown Myotis in Nevada, by the numbers

Occasional in Nevada 61st most recorded of 142 mammals logged in Nevada

80 occurrence records
2 with iNaturalist photos
Sep 28, 2025 Last seen in Nevada

Records from 2000–2026.

When to look for the Western Little Brown Myotis in Nevada

Most sightings fall in July to August.

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

Monthly Nevada records (table)
MonthRecords
January0
February0
March0
April1
May2
June4
July38
August31
September4
October0
November0
December0

Monthly western little brown myotis occurrence records (iNaturalist and GBIF) in Nevada, 2000–2026.

Seasonality

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

Occurrence map

Where Western Little Brown Myotis has been recorded in Nevada

80 records mapped · zoom and drag to explore

80 Nevada records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Toiyabe National Forest 6
East Humboldts Wilderness 2
Ruby Mountains Wilderness 1

Protected places with the most western little brown 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 Nevada

CountyRecords
Elko County 52
Washoe County 11
Churchill County 6
Mineral County 6
Carson City County 3
Storey County 1
Lander County 1

The complete county distribution, spread across 7 Nevada counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Nevada’s 82 western little brown myotis records lack a named concentration in this overlay. Their value is as evidence of documented occurrence, not as a count of the state’s bats.

The strongest reporting falls in summer, when Nevada’s high country is easiest to reach but low deserts are hottest. That may shape where observers submit records.

The total combines 2 research-grade iNaturalist records and 80 GBIF records. Those records measure documented encounters, not Nevada’s population size. It’s native to Nevada. NatureServe ranks it S2 (Imperiled) in Nevada. The IUCN lists it as Endangered globally.

Occurrence data from iNaturalist and GBIF.

Little brown myotis roosting alertly on a wooden beam
Full species profile Western Little Brown Myotis Myotis lucifugus Size 8–9.5 cm3.1–3.7 in Weight 6–13 g0.2–0.5 oz Lifespan 35 yr View the full profile

More mammals in Nevada 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"