Since the membranes have excellent healing capacities, those wounds usually pose no threat to the bat. Bats are not blind. All bats have eyes, and a number of species, particularly Flying foxes, have very large eyes and excellent eyesight which helps them find their way and their food in twilight and above the canopy at night. In contrast, bats which rely almost exclusively on sonar for finding their way in the dark and for foraging, have mostly tiny eyes and rather poor eyesight. This may have led to the widespread myth that bats are blind.
Most bats live in groups, and group size varies dramatically among species.
Many bats, however, live in smaller groups, ranging from a pair to a few hundred. Roosts of bats include also manmade structures such as attics, roofs, and eaves of houses as well as places under bridges, in tunnels, and in culverts. They select a leaf of a particular plant, such as those of palms and wild bananas and modify it the way that the leaf forms a small tent-like shelter. This tent is accessible from below and is inhabited for a period of time by a small group of those 'tent-making' bats. The tents serve as an excellent shelter against rain and predators.