What is the largest animal to ever live on Earth?

The largest animal to ever live on Earth is the blue whale (Balaenoptera musculus). Adult blue whales can reach lengths of up to 30 meters (98 feet) and weigh as much as 180 metric tons. Despite their massive size, blue whales feed primarily on small organisms like krill, consuming up to 4 tons of krill per day. Blue whales are found in oceans worldwide, migrating long distances to feed and breed. Their size and gentle nature make them a remarkable species in the animal kingdom.