Piranha have a notorious reputation. These omnivorous fish are found in the Amazon River and its tributaries, where they prey on other fish and mammals, as well as plant matter. They gather in shoals, not so much for feeding purposes but for proptection - because the Piranha features on the menu of caimans, dolphins and other semi-aquatic predators. Indeed, they are actually quite shy. They do come equipped with a sharp array of teeth, and have been known to attack people - or livestock - as they ford the rivers, but their wicked reputation is greatly exaggerated.
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