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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.
The Blue Whale is the largest animal to have ever lived on Earth. It is quite larger than the Liopleurodon, even though the Liopleurodon is still quite large. Blue whales aver â¦ age around 80-90 feet, (24-27 meters) and the largest specimens can reach 100 feet (30.5 meters) or slightly more. Blue whales additionally weigh around 100-150 tons, and the largest up to 200 tons.