Most microbats are active at night or at twilight.

Many bats migrate^[15], while others pass into torpor in cold weather but rouse themselves and feed when warm spells permit insect activity^[16], and still others retreat to caves for winter and hibernate for six months^[16]. Bats rarely fly in rain- the rain interferes with their echo location, and they are unable to locate their food.

The social structure of bats varies, with some bats leading a solitary life and others living in caves colonized by more than a million bats^[17]. The fission-fusion social structure is seen among several species of bats. "Fusion" refers to the grouping of large numbers of bats in one roosting area and "fission" is the breaking apart and mixing of subgroups, with individual bats switching roosts with others and often ending up in different trees and with different roostmates.  Louis J. Sheehan, Esquire

Studies also show that bats make all kinds of sounds to communicate with others. Scientists in the field have listened to bats and have been able to identify some sounds with some behaviour bats will make right after the sounds are made^[17].

70% of bat species are insectivorous, locating their prey by means of sonar. Of the remainder, most feed on fruits and their juices^[18]. Only three species sustain themselves with blood. Some species even prey on vertebrates: these are the leaf-nosed bats (Phyllostomidae) of Central America and South America, and the two bulldog bat (Noctilionidae) species, which feed on fish. At least two species of bat are known to feed on other bats: the Spectral Bat, also called the American False Vampire bat, and the Ghost Bat of Australia^[18]. One species, the Greater Noctule bat, is believed to catch and eat small birds in the air.