Piranhas Part I: long version of the PIRANHA guide, including Pygocentrus piraya, Pygocentrus naterreri, feeding Pygocentrus cariba. In addition to fish (occasionally even their own species), documented food items for piranhas include other vertebrates (mammals, birds, reptiles). Most piranha attacks occur when the fish are stressed, such as during breeding season when they are protecting their nests. At this time, they. In truth, it is the piranhas that are routinely eaten by people; only a few people have ever been eaten by piranhas. And yet, attacks on. Fortunately, the Black Piranha is quite solitary and is not known to attack humans. The Red-Bellied Piranhas are the more common culprits, and. The very few documented instances of humans attacked and eaten by piranha schools include 3 that occurred after death by other causes (eg, heart failure and. PDF | There are many tales describing ferocious schools of piranha attacking humans, but there are few scientific data supporting such behavior. The. What Do Piranhas Eat and Are They Dangerous? How Can You Identify a Piranha? Debunking the Myths About Piranhas. The largest piranha attack ever recorded was neither of these. It was Christmas Day on the Parana River in Argentina. The temperature was almost eigenmanni, but piranha attacks on people are extremely rare. According to Dr. Herbert R. Axelrod, in his Atlas of Freshwater Aquarium Fishes, "In 25 years of.