Western Little Brown Myotis in Maryland

Myotis lucifugus

Native to Maryland S1 Critically Imperiled in Maryland

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

IUCN Red List status

EN – Endangered

Very high risk of extinction in the wild.

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

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 Maryland, by the numbers

Rare in Maryland 57th most recorded of 57 mammals logged in Maryland

2 occurrence records

2 with iNaturalist photos

Records from 2000–2026.

When to look for the Western Little Brown Myotis in Maryland

Most sightings fall in January.

2 Maryland occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence. Based on a small number of dated records; the seasonal pattern may not be representative.

Monthly Maryland records (table)

Month	Records
January	1
February	0
March	0
April	0
May	0
June	0
July	0
August	1
September	0
October	0
November	0
December	0

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

Seasonality

Sparse observation record in Maryland; presence confirmed but timing of activity not well documented.

Occurrence map

Where Western Little Brown Myotis has been recorded in Maryland

2 records mapped · zoom and drag to explore

2 Maryland records mapped

Where it's recorded in Maryland

County	Records
Washington County	1
Frederick County	1

The complete county distribution, spread across 2 Maryland counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Maryland has just 2 little brown bat records since 2000, one from Washington County in January and one from Frederick County in August. That’s far too few to show where or when the bat turns up in the state.

The standing here is as serious as it gets at the state level: NatureServe ranks the little brown bat S1, critically imperiled, in Maryland, and the IUCN lists it as Endangered worldwide. White-nose syndrome, which spreads in crowded winter hibernation sites, is the reason a once-common bat now draws that kind of attention.

A record this thin shouldn’t be read as absence. A small bat that flies at night and spends the winter deep in caves and mines is easy to miss.

Occurrence data from iNaturalist and GBIF.

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 Maryland 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