Beneath the waters swam the dreaded red-bellied piranha, the pack-hunting fish whose jagged teeth can strip the flesh from an animal in minutes.

BBC: Taming the heart of the Peruvian Amazon

The drink is sweeter than Red Bull, to appeal to more consumers--and in more ways than one: Piranha's gross profit margin is 42%, compared with Red Bull's 33%.

FORBES: Gone Flat