Red-bellied piranha

Red-bellied piranha (Pygocentrus nattereri) may like like a cute little fish, but they have a reputation

for being the most ferocious freshwater fish in the world. There species live in the Amazon river basin, coastal rivers northeast Brazil and the basin of Paraguay, Parana and Essequilbo rivers. They have a set of razor sharp teeth that is capable of stripping flesh from prey such as, crustaceans, fish, insects, worms, water birds and even large mammals. There name comes from the color on its belly when fully grown, although juveniles are silver bellies with darker spots