National Geographic Channel, abreviado como NatGeo (curiosamente tambien fue mencionado como Geografia Universal) es un canal de television por cable y satelite lanzado por la National Geographic Society el 1 de septiembre de 1997. Whale song recordings off Hawaii have revealed a strange series of deep beats almost inaudible to humans. The latest release in the humpback whalea€™s haunting sound collection is a track so unusual that scientists hardly know what to make of it. Unlike anything on the hit album Songs of the Humpback Whale (released in 1970, the wildlife recording went multi-platinum), the mysterious new noise has such a low beat ita€™s scarcely audible. Near the lower limit of human hearing, the so-called a€?pulse trains" are deeper than any confirmed humpback vocalization, according to Jim Darling, a research biologist with the Whale Trust Maui in Hawaii.
It's a€?as if listening to a heartbeat with a stethoscope,a€? says Darling, whose study on the phenomenon was published November 5 in the Journal of the Acoustical Society of America.
In research partially funded by the National Geographic Society Committee for Research and Exploration, Darling and colleagues recorded the strange sounds near the Hawaiian island of Maui (map), where up to 10,000 humpbacks gather each winter to give birth and mate. Humpback vocalizations, including the complex and wide-ranging a€?whale songa€? performed by males, typically have an audio frequency between 80 and 4,000 hertz (Hz).

Easily masked by such background ocean noise, ita€™s a sound a€?it took me years to convince myself I was hearing,a€? he says.
But Alison Stimpert, a vertebrate ecologist with Moss Landing Marine Laboratories in California, says it wouldna€™t surprise her if humpbacks create the sounds.
What role such pulses might play in humpback communication is impossible to say at this stage. But they were recorded when adult females had male company, suggesting the sounds are connected to the mating game. Whether it's males or females that make the deep beats isna€™t yet known, raising the intriguing possibility that supposedly quiet females use them to be heard among the loudly musical males.
October 11, 2013a€”Humpback whales are known for their unique feeding behaviora€”called bubblea€”netting-at the water's surface.
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Long thought silent, females may have their own, low-frequency songs, a new study suggests.
But the newly described pulse sounds were found to have a significantly lower frequency of around 40 Hz. Screenshots are only proposed to help illustrating, identifying and promoting corresponding TV channels. By mounting cameras on the animals, researchers saw for the first time that these whales were bottom-feeding.

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