In general, piranhas are more likely to feed on dead or dying fish, insects, and other small animals. They are also known to attack larger animals that are injured or struggling, such as livestock or humans who are swimming in their habitat.
Piranhas have a powerful bite and sharp teeth that can inflict significant injuries. However, the idea that a school of piranhas can quickly devour a human being is a myth. In most cases, piranha attacks result in relatively minor injuries, such as cuts and bruises.
Despite their reputation, piranhas are an important part of the Amazonian ecosystem. They help to keep the waters clean by scavenging on dead and dying animals, and they are a food source for other animals, such as caimans, birds, and other fish.