Maine mammals

Western Little Brown Myotis in Maine

Myotis lucifugus

Native to Maine S5 Secure in Maine

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

Western Little Brown Myotis in Maine, by the numbers

Rare in Maine 62nd most recorded of 85 mammals logged in Maine

53 occurrence records
7 with iNaturalist photos
Sep 17, 2025 Last seen in Maine

Records from 2000–2026.

53 total records count every Maine occurrence from GBIF and iNaturalist; the monthly chart covers the 47 records with a full observation date.

When to look for the Western Little Brown Myotis in Maine

Most sightings fall in September.

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

Monthly Maine records (table)
MonthRecords
January0
February0
March0
April0
May3
June2
July5
August13
September24
October0
November0
December0

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

Seasonality

Year-round in Maine, with recorded sightings peaking in September.

Occurrence map

Where Western Little Brown Myotis has been recorded in Maine

53 records mapped · zoom and drag to explore

53 Maine records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Baxter State Park 6
Acadia National Park 2

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 Maine

CountyRecords
Piscataquis County 18
Kennebec County 16
Hancock County 8
Oxford County 4
Cumberland County 2
Franklin County 1
Sagadahoc County 1
Aroostook County 1
Other localities 2

The complete county distribution, spread across 8 Maine counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Just 53 Maine records exist for the little brown myotis, a bat that was once among the most frequently recorded in the Northeast before a fungal disease emptied its winter colonies.

Summer nights over Maine’s lakes and slow rivers

This bat hunts moths, mosquitoes, and midges low over open water, so Maine’s central lakes region and the slow rivers threading the North Woods make good summer hunting ground. It roosts by day in barns, camp attics, and behind loose siding, the same kind of building cover that made it a familiar sight around lakeside cabins before its numbers fell.

A disease that hit the Northeast hardest

White-nose syndrome, a cold-loving fungus, reached the Northeast not long after its 2006 discovery in New York and spread through the hibernating colonies this bat depends on to survive winter. Maine’s hibernating bats sit inside that hard-hit region, and the state’s thin current record count likely reflects the same losses documented at hibernation sites across the eastern United States.

Status in Maine

NatureServe ranks the little brown myotis S5, secure, in Maine, and it’s native to the state, though that rank reflects the wider dataset more than the steep losses recorded at eastern hibernation sites since the disease arrived.

Occurrence data from iNaturalist and GBIF.

More mammals in Maine 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"