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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 largest animal that ever lived, is alive now, and is the Blue Whale, however, there are two Dinosaurs that could perhaps be larger. Amphicoelias Fragillimus, which if existed would have been up to 196 feet long and 122 tons. Also, Bruhathkayosaurus Matleyi, which possibly was 110 feet long and 139 tons.