Piranhas live in enormous pack , or shoals. They spend most of Their time hunting for food. River are their primary habitat although, as a result of massive flooding, they may occasionally find their way into lakes. But it is thought that they are unable to breed outside of rivers. Piranhas have voracious appetites, and they seek river locations that have plentiful fish supplies. They are found in any well-stocked river within their natural habitat.