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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.
Gwydion Madawc Williams, Degree in Zoology plus a lot of reading. The Blue whale is the largest living mammal, and thought to be the most bulky animal ever. The African elephant is the largest living land mammal. But many extinct species were bigger. Paraceratherium, a long-legged and long necked relative of the rhinocerous, is often viewed as the largest ever - see Biggest Ever Land Mammal | Paraceratherium.