Summary: Hollywood has made piranhas look like antagonizing animals that are ferocious and death-filled. This didn't stop three people from the University of Liége. Willingly, the three pulled out piranhas from a tank and the found that they make croaking sounds. Four different sounds were discovered by researchers observing the animals. One sound was from picking the piranhas up, one was from them snapping at each other, one was from piranhas fighting, and the last was found from piranhas circling potential food.
Impact: This can be taken as useless information to some people and it can be taken ways by other people.
Critique: Quite frankly, I like piranhas and I want one as a pet so this just supports my reason to keep one. According to researchers they're friendly.
Reference: http://www.biologynews.net/archives/2011/10/13/aggressive_piranhas_bark_to_say_buzz_off.html
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