You really don't have to worry about most species of piranha. As long as you stay out of the water, they won't kill you. Now flying piranhas, they're a different story. Here's a specimen preserved by taxidermy artist Julien Salaud. They look pretty, but you don't want one coming up to your bird feeder.
Tokyoflash Treasure Hunt - Win a Tokyoflash Watch of Your Choice!
Going on right now: Tokyoflash Treasure Hunt #26. Win a Tokyoflash watch and neat stuff from the NeatoShop. It's fun and easy to play: Link