The blue whale is the largest animal on Earth, reaching lengths of up to 100 feet and weighing as much as 200 tons. These magnificent creatures are known for their long, streamlined bodies and distinctive blue-gray color. They primarily feed on tiny shrimp-like animals called krill, consuming up to 4 tons of them each day during feeding season. Despite their enormous size, blue whales are gentle giants. They are found in oceans around the world, often migrating long distances between feeding and breeding grounds. Their haunting songs can travel for miles underwater, making them one of the most fascinating marine animals to study.