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| Despite their fearsome reputation, piranhas are wimps that gather in large shoals to protect themselves from predators, scientists said.Rather than aggressive killers, research shows piranhas are omnivorous scavengers, eating mainly fish, plants and insects.Previously it was thought piranhas shoaled as it enabled them to form a cooperative hunting group. However, we have found that it is primarily a defensive behavior. Piranhas face constant attack from predators including river dolphins, caiman, a relative of the crocodile and the giant piracucu.Their cautious behavior is crucial to avoid being
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