The world's largest mammal is the blue whale. It can grow up to 30 meters in length and weigh up to 180 metric tons.
The blue whale is the largest animal to have ever lived on Earth and is found in all the world's oceans. It is a migratory species, travelling thousands of miles each year in search of food. It is also an endangered species, with only an estimated 10,000-25,000 individuals remaining in the wild.