Blue whale. The blue whale is the largest mammal on the planet. Its tongue alone weighs as much as an elephant, and when it opens its mouth, up to 90 tonnes of water can fit into it.
The blue whale is the largest mammal on the planet. Its tongue alone weighs as much as an elephant, and when it opens its mouth, up to 90 tonnes of water can fit into it. It also has the biggest heart in the world, weighing 180 kg and making it about as large and heavy as a gorilla.
