Piranhas, it turns out, can be excellent communicators, a new study suggests. But don't get the idea they're going soft—their barks, croaks, and clicks likely mean "leave me alone," "I might bite you, ...

This week's big movie release, "Piranha 3D," does for the toothy South American fish what "Jaws" did for sharks 35 years ago. Hordes of mega-piranhas terrorize bikini-clad beauties ... in 3-D. If that ...