article_snippet: Peacock tails may be hard to miss, but humans are unaware of the noise created by the bird's pretty plumage.
article_snippet: Scientists have shown that peacocks shake peacocks tails to make a noise that is too low for us to hear.
article_snippet: Male birds may make the infrared rumble to scare off an approaching rival or to attract a mate.
article_snippet: Researchers at the University of Manitoba in Winnipeg, Canada, have shown that the birds make infrasound noises - below 20 hertz - using the birds tails and that other peacocks respond to the birds.
article_snippet: Most humans hear noises between 20 and 20,000 hertz.
article_snippet: When peacocks shake peacocks tale feathers, most humans hear a rustling sound.
article_snippet: But the scienitsts found that the birds hear a loud sound of between 70 and 108 decibels, according to the study published in the journal Animal Behaviour.
article_snippet: Male and female peacocks became more alert and moved around when the low noises were played back to Male and female peacocks by researchers, with males shrieking out in response.
article_snippet: Experts are unsure how the birds detect infrasound, but know that some can feel vibration through Experts legs.
article_snippet: Peacocks have brightly coloured plumage that Peacocks shake to attract the much duller coloured peahens to mate .