Myotis septentrionalis (Northern Long-eared Bat)

Weight: 6-9 grams

Wingspan: 23-26 centimeters

[Call File Not Yet Available]



Southern Canada and the central and eastern United States southward to northern Florida.


Ecology and Behavior:

Northern long-eared bats hibernate in parts of caves and mines that are relatively cool, moist, and where the air is still. Hibernation may begin as early as August and may last for 8-9 months in northern latitudes. In summer, they roost by day in a variety of shelters, including buildings and under tree bark and shutters, but at night they commonly use caves as night roosts. Northern long-eared bats seem much more solitary in their habits than other members of the genus Myotis, and they generally are found singly or in small groups containing up to 100 individuals. Although they frequently hang in the open, they seem to prefer tight crevices and holes. Sometimes only the nose and ears are visible, but they can be distinguished from most other species of Myotis by their long ears.

Food Habits:

These bats forage mainly on forested hillsides and ridges rather than in streamside and floodplain forests. They consume a variety of small night-flying insects.

Reproduction and Longevity:

Presumably most mating occurs in autumn prior to hibernation. Apparently small nursery colonies are formed in June and July where pregnant females give birth to one baby. Mothers may be able to retrieve their young that fall from roost sites. Lifespan may be more than 18 years.

Status of Populations:

Uncommon over most of its range.

Text, in its original form, provided by T. L. Best, M. J. Harvey, and J. S. Altenbach. Printed spectrographs provided by M. J. O'Farrell. Distribution maps, call descriptions, and AnaMusic sound clips produced by W. L. Gannon. Accounts assembled by T. C. Sanchez-Brown.