The blue whale is the bigger living animal in the world.It grows up to 30 meters long, and the largest can weigh more than 180 metric tons. The tongue of a blue whale alone can weigh as much as an elephant, and its baby blue whale weigh up to 2.7 metric tons when it is born, and gains 91 kilograms every day for its first year. But these enormous animals can swim at a fast speed of 32 kilometers an hour.