Like many other bats, the New Zealand long-tailed bat is nocturnal (2), leaving its roost at dusk to hunt small, flying insects such as beetles, midges, mosquitoes, moths and mayflies (5). It flies quickly and silently (2), and may use its interfemoral membrane to scoop up insects while in flight (6).
The New Zealand long-tailed bat has been found to roost both alone and in colonies containing many hundreds of individuals (2) (7). Females are generally more gregarious than males, and form crowded maternity roosts during the gestation period, which increases the bat’s temperature and consequently decreases the gestation period (7).
The New Zealand long-tailed bat mates in early autumn and a single offspring is born around mid-December. The young takes flight at five to six weeks old and females bear their first young around the age of two or three years (8).
Over winter the New Zealand long-tailed bat hibernates (2), for up to four or five months in the colder parts of its range and for just a few weeks in warmer regions (9).