Bok
06-18-2012, 10:57 PM
Male birds emit low-pitched sounds inaudible to human ears
More... (http://www.sciencenews.org/view/generic/id/341606/title/Peacocks_ruffle_feathers%2C_make_a_rumble)
More... (http://www.sciencenews.org/view/generic/id/341606/title/Peacocks_ruffle_feathers%2C_make_a_rumble)