A piranha or piraña ( or, ; ) is a member of a family of omnivorous freshwater fish which live in South American rivers. In Venezuelan rivers, they are called caribes. They are known for their sharp teeth and a voracious appetite for meat. Taxonomy Piranhas belong to the subfamily Serrasalminae, which also includes closely related herbivorous fish such as pacus. Traditionally, only the four genera Pristobrycon, Pygocentrus, Pygopristis and Serrasalmus are considered to be true piranhas, du… (More on Piranha)