This process is called echolocation. Most species of bats eat night-flying insects. In a laboratory study, little brown bats capture as many as 1200 fruit flies per hour, or 1 in every three seconds. Other bats eat fruit. In their roles as pollinators, bats have contributed to the growth of tropical plants such as bananas, dates, figs, avocados, cashews, and cloves.
Bats have small, but perfectly good eyes.
They can see in daylight just like other mammals. Bats choose all kinds of dark nooks and crannies for their homes called roosts. They can crawl on all fours, sleep upside down for hours at a time and even give themselves a good cleaning while dangling by one foot. When it is not in flight, a bat's normal position is head down. A bats hold on its roost is so powerful that it may not be broken even when the animal dies.