How discovered echolocatin?

Echolocation was discovered through the observation of certain animals, particularly bats and dolphins, which use sound waves to navigate and locate prey. In the early 20th century, researchers like Donald Griffin conducted experiments that demonstrated bats emit high-frequency sounds and interpret the returning echoes to determine the location and distance of objects. This groundbreaking work established echolocation as a biological sonar system, leading to further studies on its mechanisms and applications in various fields.