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[16] [17] The frequency of pygmy blue whales in the Antarctic has steadily decreased at a rate of a few tenths of hertz per year since 2002. [18] One hypothesis is that as blue whale populations recover from whaling, this is increasing sexual selection pressure (i.e., lower frequency indicates larger body size).
All the whales in an area sing virtually the same song at any point in time and the song is constantly and slowly evolving over time. [citation needed] For example, over the course of a month a particular unit that started as an upsweep (increasing in frequency) might slowly flatten to become a constant note. [12] Another unit may get steadily ...
Toothed whale (odontocete) vocal anatomy. Most mammalian species produce sound by passing air from the lungs across the larynx, vibrating the vocal folds. [3] Sound then enters the supralaryngeal vocal tract, which can be adjusted to produce various changes in sound output, providing refinement of vocalizations. [3]
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The examples include ground vibrations produced by elephants whose principal frequency component is around 15 Hz, and low- to medium-frequency substrate-borne vibrations used by most insect orders. [15] Many animal sounds, however, do fall within the frequency range detectable by a human ear, between 20 and 20,000 Hz. [16]
Whales: Two groups of whales, the humpback whale and a subspecies of blue whale found in the Indian Ocean, are known to produce repeated sounds at varying frequencies, known as whale songs. Male humpback whales perform these vocalizations only during the mating season, and so it is surmised the purpose of songs is to aid sexual selection .
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The 52-hertz whale, colloquially referred to as 52 Blue, is an individual whale of unidentified species that calls at the unusual frequency of 52 hertz. This pitch is at a higher frequency than that of the other whale species with migration patterns most closely resembling the 52-hertz whale's [ 1 ] – the blue whale (10 to 39 Hz) [ 2 ] and ...