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…showed last 75 words of 313 total…eat any prey and are not liked by fisherman, non-of the 18 species are in any danger. Humans try to avoid contact with this species. They will eat anything, and are very aggressive. There are lots of scientists out there studying the piranha. They are currently trying to figure out exactly what the danger to humans is, it is thought to be slim. Fish three times the size of them are most likely to be attacked!