Piranhas are some of the most notorious freshwater fish species worldwide. They are well known for their keen and triangular teeth and powerful jaws. Piranhas are originally from the Amazon Basin and ...

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A freshwater Amazonian fish has evolved scales with microscopic armorlike structures specially designed to resist a piranha's piercing bite, new research shows. Arapaima gigas is the largest — and ...

Researchers in a California biomechanics lab recently staged what should have been the most lopsided freshwater cage match of all time. In one corner was a red ...

Piranhas are among the most feared freshwater fish in the world, known for their sharp triangular teeth and powerful jaws. Found mainly in South American rivers, these fish often swim in large shoals.