Which one among the following waves bats use to detect the obstacles in their flying path?

Bats utilize ultrasonic waves to detect obstacles and hunt prey through a process known as echolocation. They emit high-frequency sound pulses, typically ranging from 9 kHz to 200 kHz, which are above the human hearing threshold [2]. These sound waves travel through the air and bounce off objects in the environment, creating echoes. By listening to these returning echoes with finely tuned ears, bats can determine the size, shape, texture, and precise location of objects, including those as thin as a human hair [2]. This biological sonar allows them to navigate and intercept prey in total darkness. While infrared cameras are often used by researchers to observe bats, the animals themselves rely on acoustic ultrasonic signals rather than electromagnetic waves like infrared or radio waves for navigation.

Sources

1. [2] https://dnr.maryland.gov/wildlife/pages/plants_wildlife/bats/batelocu.aspx