Even its predators find it hard to catch them. A bat s call may last from 1 to 100 thousandths of a second. Using calls of different pitches means the bat recognizes the order of which the echoes return. This means that the bat builds a mental picture of the surroundings in the bat s mind. The bat then listens for changes, like an insect moving around.
Individual bats have their own call to tell each other apart.
The bat can change volume and the quality of its sounds to suit the surroundings it is flying through. When a bat is flying close to trees, the bat uses a lower volume. If a bat is flying from one place to another, for instance from one tree to another tree it will use simple calls, but when hunting the calls increase in volume and quality. Although a bat's high pitched calls are too high for humans to hear, some people can sense the sound. The fruit eating bat has a good sense of sight.