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, ...

Piranha is a general name used to describe a group of freshwater fish with a fearsome reputation when it comes to feeding. There are between 40 and 60 different species; none grow larger than two feet ...

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 ...