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Contrary to popular belief, birds cannot hear ultrasonic sound. [3] Some smartphone applications attempt to use this technology to produce high frequency sounds to repel mosquitoes and other insects, but the claims of effectiveness of these applications and of ultrasonic control of pest creatures in general has been questioned.
High-frequency whistles are used on vehicles to drive deer away from highways, and similar devices are used to deter certain types of insects or rodents. Repellents of this kind for domestic cats and dogs include ultrasonic devices which emit a high-frequency noise that does not affect humans. These types of non-chemical repellents are ...
The ultrasonic vocalizations emitted by rats and mice have been categorized. There are three classifications: 22-kHz vocalizations, 40-kHz vocalizations, and 50-kHz vocalizations. [ 1 ] The 40-kHz calls are short in duration, lasting anywhere from 80-150 milliseconds, while the 50-kHz calls tend to be even shorter, lasting anywhere from 20-100 ...
Wolfgang M. Schleidt (born December 18, 1927, in Vienna) is an Austrian scientist specializing in the areas of bioacoustics, communication and classical ethology. [1] He was assistant to Konrad Lorenz (1950 – 1965), professor of zoology at the University of Maryland (1965–1985) and director at the Konrad Lorenz Institute for Ethology, Vienna of the Austrian Academy of Sciences.
The ear's shape also allows the sound to be heard more accurately. Many breeds often have upright and curved ears, which direct and amplify sounds. As dogs hear higher frequency sounds than humans, they have a different acoustic perception of the world. [24] Sounds that seem loud to humans often emit high-frequency tones that can scare away dogs.
It has been shown that human subjects can monaurally localize high frequency sound but not low frequency sound. Binaural localization, however, was possible with lower frequencies. This is likely due to the pinna being small enough to only interact with sound waves of high frequency. [19]
[3] [1] Devices emitting loud noises have also been used, including broadcasts of killer whale sounds, pingers, and acoustic buzzers. [3] These often employ shrill sounding screams broadcast between 12 and 17 kHz. Acoustic deterrent devices normally broadcast near 10 kHz and use high volume. [3]
The term echolocation was coined by 1944 by the American zoologist Donald Griffin, who, with Robert Galambos, first demonstrated the phenomenon in bats. [1] [2] As Griffin described in his book, [3] the 18th century Italian scientist Lazzaro Spallanzani had, by means of a series of elaborate experiments, concluded that when bats fly at night, they rely on some sense besides vision, but he did ...