The northern long-eared bat is known to forage along forest edges, on hillsides and ridges, in clearings, canopies, and over water (1) (2) (5). A generalist predator, the northern long-eared bat takes its prey opportunistically using echolocation (1) (4). It typically catches its prey during flight (1) (2), and feeds on a variety of insects, including moths, beetles, flies, caddisflies and spiders (2). This species is most active one or two hours after sunset, and again before sunrise (2) (4).
Generally a solitary species, the northern long-eared bat is rarely seen in large groups (5). Interestingly, male and female northern long-eared bats will always roost separately, however; this species may sometimes roost with other bat species (1). The northern long-eared bat hibernates in small groups in caves and abandoned mines from late autumn to early spring (4).
Mating occurs in large congregations, or swarms, outside caves and abandoned mines prior to hibernation (2) (4). The female stores the sperm through hibernation and begins ovulation when it emerges in the spring (4). Small maternity colonies are formed by groups of female northern long-eared bat during the breeding season, where up to 60 females may be present in a colony (1) (2). Each female gives birth to a single pup around two months after the spring emergence (4).