Testing in animals differs from the method commonly used with humans of voluntarily reporting if a sound is heard. When determining the frequency range in animals, an investigator usually must first train the animal to respond to a presented sound stimulus by selecting between two actions using rewards. Often this response is to try to drink or eat from one of two dispensers when a sound is heard.
The sounds are randomly presented from one side or the other, and the subject must select the right dispenser on the same side as the stimulus to get the reward; otherwise no food or drink is dispensed. This is done with the animal hungry or thirsty to motivate responding. Stimuli are different pure tones at varied frequencies units of Hertz [Hz] - or kilohertz [kHz] and at different loudness intensities units of decibels [dB] - a logarithmic measure.
The investigator then plots the responses on an audiogram, a graph of the softest intensity at which the subject was able to detect a specific. Researchers suspect that these particular species have developed this communication component in part as a result of living near noisy, turbulent streams.
Gisele LeBlanc has been a writer and editor since , with a focus on children's publishing. By using the site, you agree to the uses of cookies and other technology as outlined in our Policy, and to our Terms of Use. Echolocation and Navigation Many bat species, as well as dolphins and other toothed whales, navigate and hunt by ultrasonic echolocation, a process achieved through the projection and reception of high-frequency pulses. Evasive Flight and Sonar Jamming Nocturnal flying insects are at risk from predatory bats, but the pressure-sensitive auditory systems of several species of insects, such as moths, katydids and lacewings, allow them to detect a bat's ultrasonic echolocation sonar.
Covert Communication Rats, mice and other rodents can communicate with other members of their species through ultrasonic vocalizations, limiting their chance of detection by certain predators. National Library of Medicine - Ultrasonic communication in concave-eared torrent frogs Amolops tormotus. Thanks to this weapon, moths are often able to escape.
Find out more about the science behind how humans hear with our article on how hearing and the ears work and at the Miracle-Ear blog.
It takes the average person 7 years before realizing they have a hearing loss and seeking help. Imagine all the beautiful, delicate sounds that may have been missed. Protect your hearing by taking the time to schedule an exam with a hearing care professional. Blog Five animals that hear better than humans. Last update on Apr, 21, The animals with the best range of hearing. Bats Bats might seem a little creepy to some of us, but that is also what makes them so fascinating. Dolphins Bats are not the only animals that use echolocation to their advantage.
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