When you hear the word piranha, in all likelihood, you may imagine a cartoonish, feral image of a crazed, carnivorous beast carving the water into a froth. But is the ferocious piranhas really as dangerous as they seem to be?

When you hear the word piranha, in all likelihood, you may imagine a cartoonish, feral image of a crazed, carnivorous beast carving the water into a froth. But is the ferocious piranhas really as dangerous as they seem to be?