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 ...

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 ...