Northern Myotis

Myotis septentrionalis

Also known as: Northern Long-Eared Myotis, Northern Long-Eared Bat

NTNear Threatened

The northern myotis is a forest bat that has lost a staggering share of its population to white-nose syndrome, a cold-loving fungus that spread through eastern hibernation caves after 2006. The IUCN now rates it Near Threatened, a step most eastern bats have not needed. Records across 14 states trace a range built around forest cover in summer and caves or mines through winter, a pattern the disease has hit especially hard.

Range through the year

Where Northern Myotis is seen

Northern Myotis is recorded in 12 US states from 551 occurrence records, most heavily in Kansas (126 records) and New York (97).

Current range551 records · 12 states
AlabamaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaIdahoIllinois · 16 records · view state pageIndianaIowa · 33 records · view state pageKansas · 126 records · view state pageKentuckyLouisianaMaineMarylandMassachusetts · 14 records · view state pageMichiganMinnesotaMississippiMissouri · 26 records · view state pageMontanaNebraska · 69 records · view state pageNevadaNew HampshireNew JerseyNew MexicoNew York · 97 records · view state pageNorth CarolinaNorth DakotaOhio · 39 records · view state pageOklahomaOregonPennsylvania · 21 records · view state pageRhode IslandSouth CarolinaSouth Dakota · 37 records · view state pageTennessee · 31 records · view state pageTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsin · 42 records · view state pageWyomingAlaskaAKHawaiiHIPuerto RicoPR
Occurrence data by state and month
Northern Myotis – occurrence records by US state and month (551 total across 12 states)
StateJanFebMarAprMayJunJulAugSepOctNovDecYear
Kansas··924236446284126
New York32216123425164197
Nebraska14·41··19272··269
Wisconsin·2·22216261··42
Ohio13113886411239
South Dakota·····6292····37
Iowa··6·1114361·133
Tennessee12··3832721231
Missouri·13312·6711126
Pennsylvania··2·4234·15·21
Illinois145···21111·16
Massachusetts·123··42·2··14

Based on 564 georeferenced US records. Shading is observation density (where people record sightings), not true abundance. Alaska, Hawaii & Puerto Rico shown as insets.

Explore by state

Northern Myotis across 12 states

Occurrence records, conservation status, and the places it turns up, state by state. Open a state for detail, or visit its full page.

  • KansasNativeOccasional127 records

    State rankVulnerable

    Countiesrecorded in 7

    Year-round in Kansas, with recorded sightings peaking in July.

  • New YorkNativeRare101 records

    State rankCritically Imperiled

    Notable placesHither Hills State Park · Letchworth State Park · Brasher Falls State Forest

    Countiesrecorded in 12

    Year-round in New York, with recorded sightings peaking in August.

  • NebraskaNativeRare70 records

    State rankCritically Imperiled

    Countiesrecorded in 8

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

  • WisconsinNativeOccasional42 records

    State rankCritically Imperiled

    Countiesrecorded in 11

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

  • OhioNativeOccasional39 records

    State rankCritically Imperiled

    Notable placesCuyahoga Valley National Park

    Countiesrecorded in 12

    Year-round in Ohio, with recorded sightings peaking in June–August.

  • South DakotaNativeOccasional37 records

    State rankImperiled

    Notable placesSand Creek Recreation Area · Badlands National Park

    Countiesrecorded in 4

    Year-round in South Dakota, with recorded sightings peaking in July.

  • IowaNativeOccasional33 records

    State rankApparently Secure

    Notable placesLedges State Park

    Countiesrecorded in 11

    Year-round in Iowa, with recorded sightings peaking in June.

  • TennesseeNativeRare31 records

    State rankCritically Imperiled

    Notable placesGreat Smoky Mountains National Park · North Cherokee National Forest & Wildlife Management Area · Shiloh National Military Park · Chuck Swan State Forest

    Countiesrecorded in 12

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

  • MissouriNativeOccasional26 records

    State rankCritically Imperiled

    Notable placesMark Twain National Forest

    Countiesrecorded in 12

    Year-round in Missouri, with recorded sightings peaking in August–September.

  • PennsylvaniaNativeRare22 records

    State rankCritically Imperiled

    Countiesrecorded in 11

    Year-round in Pennsylvania, with recorded sightings peaking in November, with a smaller rise in May and July–August.

  • IllinoisNativeRare16 records

    State rankCritically Imperiled

    Notable placesPecumsaugan Creek/ Blackball Mines State Natural Area

    Countiesrecorded in 8

    Year-round in Illinois, with recorded sightings peaking in February–March.

  • MassachusettsNativeRare14 records

    State rankCritically Imperiled

    Countiesrecorded in 2

    Year-round in Massachusetts, with recorded sightings peaking in July, with a smaller rise in April.

IUCN Red List status

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

NT – Near Threatened

Close to qualifying as threatened in the near future.

SizeNorthern Myotis beside a 1.8 m adult, drawn to scale
Created by potrace 1.16, written by Peter Selinger 2001-2019 Created by potrace 1.16, written by Peter Selinger 2001-2019
Body length
9–9 cm3 in–3 in
Weight
6–6 g0.2–0.2 oz

Silhouettes drawn to scale against a 1.8 m5 ft 11 in adult.

Elevation

From 200 georeferenced records, the Northern Myotis is recorded from sea levelsea level to 1,058 m3,471 ft, with half of sightings below 342 m1,122 ft.

Each band shows the share of georeferenced sightings that fall within it. Records cluster where people live and hike, so low, populated elevations are over-represented. Read this as observation density, not true abundance.

Best encounter

Where and when to see a Northern Myotis

Your best chance: Kansas.

Where
KansasKS
Trophic relationshipsFood web What a Northern Myotis eats, and what eats it.
Eaten by

Few natural predators as an adult

This speciesNorthern Myotis
Greater Red DartAbagrotis alternataJulia's Idia MothIdia juliaOld Gold Isocorypha MothIsocorypha mediostriatellaLarge Yellow UnderwingNoctua pronubaBroken-banded Leafroller MothChoristoneura fractivittanaGreenish Apple MothClepsis virescanaGarden TortrixClepsis peritanabeetles
Eats8

A sample of documented feeding relationships, filtered to species that also occur in the US. Diet and predators vary by region and season, and this is not a complete list, many animals eat, and are eaten by, more than what has been formally recorded here.

Life history

The Northern Myotis (6 g0.2 oz) is a carnivore that first breeds around 1 years, carries a 50-day gestation, and bears about 1 young per litter. Maximum recorded longevity is 19 years.

Life cycle

  1. Gestation50 days
  2. Birthlitter of 1 young
  3. Sexual maturity1 yr (female)
  4. Typical lifespan19 years
  5. Maximum recorded longevity19 years

Reproduction

Gestation
50days
Litter size
1youngaverage
Litters / year
1litter
Age at first breeding
1years

Diet composition

Carnivore

By foraging composition: 100% invertebrates.

  • Invertebrates100%

Most active at night.

Typical values for the species, not local measurements. Maximum longevity is the longest lifespan on record; most individuals live far less.

Commonly confused with

Animals people sometimes mistake for the northern myotis, and how to tell them apart.

A bat named for its ears

The northern myotis, also called the northern long-eared bat, carries ears noticeably longer than most of its close relatives. That feature helped give it the name. Through summer it hunts insects in the cluttered space beneath a forest canopy, gleaning prey off leaves and bark as often as catching it in open air. That technique fits its ears and slower, more maneuverable flight better than the open-sky chases favored by many other bats.

A range built on forest and cold caves

Confirmed records span 14 states, from Nebraska and the Great Lakes east through New York and Pennsylvania down into the Appalachians and North Carolina. Ohio and Pennsylvania carry the largest documented counts, while North Carolina and Washington, DC register only a handful each. That range traces a species tied to two very different habitats across the year. It keeps wooded summer roosts under loose bark or in cavities, then hibernates through winter in cool, humid caves or abandoned mines.

Northern myotis hanging from a rock ceiling in a cave, long ears visible against its tan fur
A winter hibernation roost, the second half of this bat’s two-habitat cycle. Photo: U.S. Fish and Wildlife Service Headquarters, CC BY 2.0.

Hit especially hard by a cold-loving disease

White-nose syndrome, a fungal disease that thrives in the cold, damp conditions of hibernation caves, has spread through the eastern United States since it first appeared in 2006. Few bats have suffered more from it than this one. The IUCN now lists the northern myotis as Near Threatened, a step most American bat species have not needed. Where the fungus has hit hardest, recent records thin out sharply. A gap in the record can reflect reduced survey effort in hard-to-reach hibernation sites just as easily as a real local loss.

Northern myotis with a metal research band on its wing, held calmly during a field survey
Wing-banding lets researchers track individual bats across seasons as they monitor the disease’s spread. Photo: Hila Taylor, CC BY 4.0.

Two habitats to protect, not one

Because this species depends equally on summer forest and winter cave shelter, protecting it means safeguarding both halves of that cycle rather than either alone. Undisturbed hibernation sites limit the disturbance that can push already-weakened bats past a critical energy threshold in winter. Intact forest with old, loose-barked trees keeps summer roosts available. Tracking real change here means watching hibernation-site counts over years, not reading a single season’s records as a population estimate.

Data & sources

The data and visualizations on this page draw on these open sources: