Four people were killed and 20 others have been injured in separate piranha attacks in Paraguay this year, causing concern among locals. On Jan. 2, a 22-year-old man temporarily went missing ...

Four people were killed and 20 others have been injured in separate piranha attacks in Paraguay this year, causing concern among locals. On Jan. 2, a 22-year-old man temporarily went missing ...

When they tossed in some beef (or perhaps a whole cow; several versions of the story exist) a feeding frenzy ensued, and an impressed Roosevelt described the piranha in a subsequent travel journal ...

How rare are piranha attacks? The BBC points out that another six-year-old from the same state, Eduardo dos Santos de Sousa, died in 2012 after piranhas ate the flesh from one of his forearms.