The largest animal currently living in the ocean is the blue whale (Balaenoptera musculus), which can grow to an astonishing length of up to 100 feet (30 meters) and weigh as much as 200 tons. These magnificent creatures are filter feeders, primarily consuming tiny shrimp-like animals called krill. Despite their immense size, blue whales are gentle giants, often swimming alone or in small groups. They can be found in oceans around the world, usually migrating between feeding and breeding grounds. Conservation efforts are essential, as blue whales were heavily hunted in the 20th century and remain endangered today.