Who is the worlds lagest animal?

The blue whale (Balaenoptera musculus) is the largest animal in the world. It is a marine mammal that can grow up to 100 feet long and weigh up to 200 tons. The blue whale's tongue alone can weigh as much as an elephant. These massive creatures feed on krill, which they filter out of the water using baleen plates. Blue whales are found in all oceans except the Arctic Ocean.