What is the heaviest animal in the world?

The heaviest animal in the world is the blue whale (Balaenoptera musculus), which can weigh up to 200 tonnes (400,000 pounds) and grow to over 30 metres (98 feet) in length. These marine mammals are the largest animals ever known to exist, even surpassing the size of the largest dinosaurs. Blue whales feed primarily on tiny shrimp-like creatures called krill, consuming up to 4 tonnes per day during feeding seasons. Despite their massive size, they are gentle giants and communicate using low-frequency sounds that can travel long distances underwater.