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Upsweep is an unidentified sound detected on the American NOAA's equatorial autonomous hydrophone arrays. This sound was present when the Pacific Marine Environmental Laboratory began recording its sound surveillance system, SOSUS, in August 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds in duration each.
Certain words in the English language represent animal sounds: the noises and vocalizations of particular animals, especially noises used by animals for communication. The words can be used as verbs or interjections in addition to nouns , and many of them are also specifically onomatopoeic .
In February 2016, a high-pitched noise was heard intermittently at night in Forest Grove, Oregon. The Department of Forestry determined that their equipment was not the cause of the sound. [1] The news about the noise was first shared with Dave Nemeyer by a Forest Grove resident, who posted a video of it on the city's Facebook page. [2]
The lyrebird is an Australian species best known for its ability to mimic man-made sounds. National Geographic has recorded these remarkable birds mimicking such unnatural noises as a chainsaw and ...
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Birds sing louder and at a higher pitch in urban areas, where there is ambient low-frequency noise. [58] [59] Traffic noise was found to decrease reproductive success in the great tit (Parus major) due to the overlap in acoustic frequency. [60] During the COVID-19 pandemic, reduced traffic noise led to birds in San Francisco singing 30% more ...
When disturbed during rest, they can emit a soft warning buzz that sounds similar to a bee, and when threatened, they can make a loud hissing noise and produce clacking sounds with their beaks. [21] At night, tawny frogmouths emit a deep and continuous "oom-oom-oom" grunting [21] at a frequency of about eight calls in 5 seconds. [22] The steady ...
In sound localization, ITDs are used as cues for location in the azimuth. ITD changes systematically with azimuth. Sounds to the right arrive first at the right ear; sounds to the left arrive first at the left ear. In mammals there is a level difference in sounds at the two ears caused by the sound-shadowing effect of the head.