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northern long-eared bat

northern long-eared bat (Myotis septentrionalis) [state and federally threatened]
Photo © Michael Durham

Features and Behaviors

The northern long-eared bat is a small- to medium-sized bat with a small forearm. Its brown fur is black at the base. The northern bat has a lengthy, pointed tragus in its long ear. Each wing is attached to the side of the foot.

The northern long-eared bat may be found statewide in Illinois. It hibernates in caves, mines and buildings. The largest concentration of wintering northern bats in Illinois is in La Salle County, but other hibernacula are located throughout the state. The bats tend to hang singly or in very small groups. Summer roosting locations include caves, mines, buildings and under tree bark. The northern long-eared bat eats insects. Mating occurs in fall and spring. Those females mating in the fall store the sperm in the uterus until spring, when it is used to fertilize the eggs. Females form small maternity colonies after leaving the winter hibernating site. Young are born in June and July. This bat has been known to live for more than 18 years.

Illinois Range


​Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Vespertilionidae

Illinois Status: state threatened, native