On quiet nights across large swaths of the African bush, you may hear a series of whooping calls in the distance. This unique sound is the long-distance vocalisation used by spotted hyenas (Crocuta ...
April 23, 2009 -- Deteriorating screws in bridges, fish that listen in the dark, medical devices that use sound to treat disease, the detected comeback of a long-gone whale, the sound of hyenas, ...
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