Most species of piranha never grow larger than 60 cm (2 feet) long. Colours vary from silvery with o.... piranha speci

Found from northern Argentina to Colombia, piranhas are most diverse in the Amazon River, where 20 different species are found. The most infamous is the red-bellied piranha ( Serrasalmus nattereri ), with the strongest jaws and sharpest teeth of all. Generally a group of red-bellied piranhas spreads out to look for prey. Most species of piranhas, however, never kill large animals, and piranha attacks on people are rare. Some 12 species called wimple piranhas (genus Catoprion ) survive solely on morsels nipped from the fins and scales of other fishes, which then swim free to heal completely. piranha speci