Sonar is not a human patent. Many animals have their own sonar. Bats emit 10 to 20 ultrasonic pulses from their throats every second, and receive echoes with their ears.
With the help of this "active sonar", they can detect tiny insects and iron wire obstacles with a thickness of 0.1mm. It seems that animals, like humans, are fighting a "sonar war"! Marine mammals, such as dolphins and whales, have underwater sonar which can produce clear food and communication signals.
Animals that have lived in the depths of the extremely dark ocean all their lives have to use sonar and other means to search for prey and avoid attacks. The performance of their sonar is far beyond the capabilities of modern human technology. Solving these mysteries of animal sonar has always been an important research topic of modern sonar technology. The "sonar" invented by us humans was invented through the principle of whales and dolphins.
Extended data:
Cetaceans are rare aquatic species among mammals, and dolphins are one of them. They evolved from Artiodactyla in terrestrial mammals and returned to the water about 50 million years ago.
Reveal the evolutionary history of cetaceans and decipher the genetic code of dolphins.
The "second entry" of cetaceans is a rare change in the life history of mammals, and their living habits have changed from terrestrial to completely aquatic. Severe environmental changes have led to significant changes in their physiology and structure to adapt to aquatic life.
For example, it has a thickened subcutaneous fat layer (whale oil), the ability of long-term diving and echolocation, and a powerful muscle system that supports underwater sports. Although people have learned a lot about the adaptive characteristics of physiological morphology, the molecular basis of these characteristics has not been systematically solved.
Baidu Encyclopedia-Cetaceans