Bats have poor eyesight, but they prefer to come out in the evening to catch mosquitoes, and the speed and precision with which they hunt are amazing. Scientists have found that the bat's predation technique does not rely on its eyes, but on its ability to "echo detection". Someone once blindfolded a bat and put it in a large glass room with a lot of wire, but it still avoided wire obstacles and accurately caught insects.
It turned out that the echo detection system in the bat's body was very ingenious. When it flies, it generates ultrasonic waves from the throat, emits them through the mouth or nose, and when it encounters an object, the ultrasonic waves are reflected back, and the bat's ears receive echoes, which can accurately identify the external environment and hunt down nocturnal insects. What's even more amazing is that the bat's ultrasonic detection system can also accurately distinguish the properties of objects. For example, some people have experimented with throwing flour worms and metal debris together, and blindfolded bats can accurately distinguish the nature of the two things, preying only on flour worms and ignoring metal debris.
The echo detection system of bats also has the characteristics of fast frequency and strong anti-interference ability. It can be imagined that when bats capture food, they find targets while flying, and sometimes they can suddenly change the original flight direction in a fraction of a second and quickly chase their prey. It is estimated that bats can emit and receive (resolve) 250 sets of echoes in a second. In addition, the bat's echo detection system can not only exclude human interference, but also not be afraid of the interaction between the same kind.
In caves inhabited by hundreds of bats, they simultaneously emit ultrasonic waves and still go their separate ways. The radar developed by scientists according to the "echo detection" principle of bats has been widely used, and the sensitivity and anti-jamming ability of radar have been continuously improved. People also imitated the bat's "echo detection" system to make "sonar glasses" and "blind pathfinders" for night military reconnaissance and blind use.