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, ...

· If you ever hear a spotted hyena making a sound, you might think it is laughing hysterically. It isn't. When a hyena is excited or scared, it lets out a noise that is a combination of a strange howl ...

Welcome back to ALL THINGS CONSIDERED. I'm Linda Wertheimer. Now, even if you've never heard a laughing hyena in the wild, you might recognize this hyena. Mr. CHEECH MARIN (Actor): (as Banzai) It's ...

Hyenas engage in plenty of play-fighting, and they have a way to let fellow hyenas know when an attack is part of a game: they bob their heads and make clear facial expressions. Known for their ...