Approximately 70% of bats are micro-bats. They have the ability to hibernate in cold temperatures and their diets largely consists of insects but can include small mammals, frogs, fish and occasionally fruit, pollen and nectar.

Insectivorous bats catch and eat their prey while flying and can remain airborne for hours at a time. To catch insects that are not flying, some bats will fly slowly, using echolocation to identify insects on leaves, branches or the ground, or they may perch on branches or on the ground and listen (without echolocating) for the sounds of moving insects before attacking.

Considering that microbats can eat as much as 40% of their own body weight in a single night, or several hundred insects per hour, they are extremely beneficial to have around when mosquitoes are a nuisance.

Most Australian micro-bats will roost in tree hollows or under bark, they can also be found in caves and cave-like structures including the cavity in walls of houses if there is a gap sufficient to allow their entry and exit.

Their eyes are reduced to small dark spots under the scales of the head and their mouth is well behind and below the tip of the snout; the body is uniform in thickness along its length with a very short tail ending in a conical spine.