The Largest mammal is the Blue Whale. This huge whale can grow to 30 meters long and weigh 190.000 kilos (= approximately 2400 humans). This giant’s heart alone is as big as a car. Its tongue is so large that an elephant would fit on it. A newborn blue whale is approximately 7 meters long and weighs 1500 kilos! This colossus is the largest animal on earth. It is larger than the largest dinosaur that ever lived!