Engineered_Piranhas were normal piranhas altered by a biological weapon, that were later accidentally released into the summer resorts river. They are the antagonists of Piranha film of 1978, and its sequel of the 1981 film, Piranha II: The Spawning, where some survived piranhas from the military camp that were not killed by the industrial wastes released by Maggie and Grogan, mutated somehow into winged creatures once they reached the sea, where they were too died because of a ship's explosion.

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