The northern long-eared bat is found in northern regions of the east and central United States and much of Canada. The bat is medium-sized, with a total length of 76-94 mm and a wingspan of 230-254 mm. 

 

This species is known to be more solitary than other bat species and inhabits mature interior forest habitat outside of the hibernation period. During hibernation, the species inhabits caves or abandoned mines. 

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The northern long-eared bat is insectivorous and feeds at night using echolocation.

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This species has been one of the most impacted by white-nose syndrome, with the species declining by 99% in the U.S. Northeast since the arrival of white-nose syndrome to the region in 2006. The species is also severely impacted by forest fragmentation and habitat loss due to its dependence on interior forest. It is federally listed as Threatened and listed in Connecticut's Wildlife Action Plan as Endangered and a Species of Greatest Conservation Need.