A piranha or piraña (or /pɨˈrænə/)'s a member of a family of omnivorous freshwater fish which live in South American rivers. In Venezuelan rivers, they're called caribes. They're 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 including pacus. Traditionally, only the four genera Pristobrycon, Pygocentrus, Pygopristis and Serrasalmus are considered… (More on Piranha)