A shoal of piranhas — that’s what you call a group of these razor-toothed fish swimming together. While they're often seen as ruthless predators, the real reason they form shoals is survival. Sticking together helps them stay safe from larger predators and increases their chances while hunting. It’s a strategy built on strength in numbers — and sharpened by some serious bite. #DiscoveryChannelIn #DiscoveryChannelIndia #DiscoveryChannel #Piranhas | Discovery Channel India