The blue whale is the largest mammal on earth.
The blue whale is the largest mammal on earth. Its tongue alone weighs as much as an elephant, and up to 90 tons of water can fit into its open mouth. It also has the largest heart in the world: it weighs 180 kg, which is about the size and weight of a gorilla.
Fun fact: When the whale opens its blowhole to breathe, it blows a 30-foot-high fountain.
