[2] The northern bat is dark brown or black with some gold touched at the tip of the hairs in the head and back region.

Females form a colony of 10–80 adults in early summer, which they disband in August, when young bats are able to fly.

The bats send out the pulse approximately once every 200 ms, and the steep FM are used to locate obstacles or targets, allowing them to fly indoors.

[2] In high latitude areas, female northern bats fly during daytime because of the short nights, but their foraging peaks after dusk and sometime before dawn.

Females select small feeding territories where their food source is abundant, and sometimes can be used by the same individual over a period of years.