About a year ago I purchased 13 baby piranhas (you’d be amazed what you can buy online). Now they’re all grown up. Who needs the nature channel when you have this!?!
A quick background on piranha’s for the layman:
They are extremely skittish fish. They use schooling or shoaling as a means of protection against predators. Just walking by the tank is enough to startle them. Usually when the mouse is first added to the tank they are initially frightened. A sentry is sent out of the school to scope out the scene and confirm the absence of predators. Once the piranha attack, it’s a battle royale for a prize of fresh meat.