In the dark, bats first scream into the void, and then listen to the echo that bounces off
In total there are 1400 species of bats.Most of them use echolocation. These animals produce sound impulses, and mainly in the ultrasonic range. That is, a person will not hear this sound.
Many bats contract the muscles of the larynxin a special way and make sounds through an open mouth. However, there are those who use other parts of the body for this. For example, leaf-nosed bats call with their noses, and some fruit bats make clicks with their wings.
As the bat approaches its prey, the frequencysound pulses rises to over 160 clicks per second. Thanks to the echo, the animal determines the shape, size of the object, as well as its direction and distance to it. The bat can make sounds up to 140 dB. In order not to become deaf, before such a cry, she contracts the muscle of the middle ear and reduces her hearing. And after that, she restores it again to detect echoes.
There are other animals that use echolocation. These are, for example, porpoises, dolphins, shrews, tenrecs.