Bats use sound to find their food and navigate in the dark. They send out high frequency clicks and listen for the echoes to locate their prey. These bat sounds are too high for humans to hear. With devices called "bat detectors" it is possible to translate the clicks to a lower frequency. The use of echoes of ultrasonic, high frequency calls to locate objects is called "echolocation". Echolocation, the sonar "sight" of bats, is analogous to the technology known as sonar. Because it is produced by living organisms rather than by machines, it is often called "biosonar."
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