This is referred to as echolocation. Another membrane extends from the inside of the hind legs to the tail, leaving the hind feet free for gripping as the bat hangs upside down in its roost. Ears Bats have greatly enlarged ears, necessary for night flying, which they keep meticulously clean with their sharp thumbs. The thumbs of the forefoot are small, equipped with sharp claws and not connected to the membrane. Behavior Bats are very shy creatures and like most wild animals, avoid contact with humans while going about their business of eating, reproducing and avoiding predators.
Bats vary greatly in their habits, depending on their species.
Some fly in daylight, others at dusk or dawn, and still others only in the dark of night. Some are found exclusively in remote caves, others in remote caves or behind the shutters of your house. Some hibernate while others migrate long distances. The flight of bats is not direct but undulating, somewhat like a stone skipping across a pond. As it hunts, the bat is virtually unmolested.