Piranah don’t technically form “packs”. Recent studies have shown that piranhas are comparatively shy fish that school for protection from larger predators. School size varies by species, though many form large schools. This website (citation) lists the typical size of red-bellied piranha (Pygocentrus nattereri) schools at around 20 individuals, though I’m sure larger schools are not unprecedented. The red-bellied piranha is the typical, flesh-eating species that most people think of when they hear piranha, though there are many species and not all are deserving of the reputation as a fierce pack hunter.
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