Piranhas have very strong jaws for clamping down on prey. Theodore Roosevelt spread a lot of scary information about these fish in his book, "Through the Brazilian Wilderness," about his travels to South America in 1913. They lose and regrow teeth, much like sharks. The piranha's top and bottom teeth work together like scissors to cut up food. Red-bellied piranhas bark to warn predators to leave them alone. They are not currently considered endangered. The piranha's conservation status has not been assessed by the International Union for Conservation of Nature. Pygocentrus piraya - (piraya, piraya piranha, black-tailed piranha, San Francisco piranha, king emperor piranha).The species was named in 1850, but no specimens have ever been found.
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