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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Have you ever heard the phrase "laughing hyenas"? Do they really laugh? In a word, no. There are four kinds of hyenas _ aardwolf, brown, spotted and striped _ but only the spotted hyena makes sounds ...

As dusk begins cloaking the Maasai Mara grasslands of southwestern Kenya, a spotted hyena slinks beneath the woody umbrella that is the acacia tree. The carnivore pauses, its rounded ears cocking ...