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15 of the Largest Animals in the World. The blue whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed.
Blue whale is not only the largest mammal on earth â¦, but the largest animal of any kind on the earth. Better still, the blue whale, is the largest animal to ever exist on the earth. There are no land mammals that would make the list of the ten largest mammals on earth. But the largest land mammal is the African elephant. But even the mighty elephant is relatively tiny in comparison to the larger species of whales.