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The short answer is, BLUE WHALE is the HEAVIEST animal to ever live. AMPHICOELIAS fragillimus (sauropod dinosaur) was the LONGEST animal to ever live. SAUROPOSEIDON proteles (sauropod dinosaur) was the TALLEST animal to ever live.

The term "large" could be defined in terms of weight, length, or even height. In addition, when you use the phrase "to ever live on Earth", I think you have to consider at least the low-end estimates provided by paleontologists and researchers who analyzed fossilized remains.

The heaviest blue whale recorded weighed roughly 195 tons. The longest blue whale recorded was 110 feet, but this whale was not weighed. It is likely it weighed close to 200 tons or slightly more. Bruhathkayosaurus matleyi, a prehistoric sauropod (titanosaur), was estimated to be the heaviest dinosaur ever to live, weighing 139-175 tons (scaled back from a previous estimate of 175-220 tons that was declared inaccurate by the original researcher). The blue whale still outweighs it, therefore making the BLUE WHALE is the HEAVIEST animal to have ever lived, which should not be surprising given that it lives in the ocean. There is always the possibility that prehistoric whales or land-dwellers weighed more, but no evidence of that has yet been found.

Amphicoelias fragillimus was also a sauropod dinosaur, a fossil of which was studied in the 1870s. The fossil has since gone missing (not sure what that means). However, studies were done before it was lost, and field notes suggest the animal could grow to between 130-200 feet in length. Even this low-end estimate is longer than that of the longest blue whale we have ever recorded. Therefore, in my view it is safe to assume that AMPHICOELIAS fragillimus was indeed the LONGEST known animal to have ever lived (130-200 ft). If other, longer whales or dinosaurs existed, no evidence of them has been found.

Sauroposeidon proteles, another sauropod dinosaur, stood at an amazing 56 feet (6 stories) with its neck extended, making it the tallest known animal to ever walk the earth. By comparison, the Brachiosaurus stood 30 feet high and the tallest modern giraffe stood 20 feet high. Therefore, SAUROPOSEIDON proteles was the TALLEST known animal to have ever lived. If anything taller existed, we do not know about it.

Again, you can't expect these estimates to be 100% accurate when you are talking about animals that lived hundreds of millions of year ago. Yet these studies involved scaling the bones of better-known species in the sauropod family, assuming their relative proportions were similar. The low-end estimates are probably correct, and at least have not been seriously called into question.

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12y ago
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13y ago

so far the blue whale is the biggest, other big animals are liopleuridon, megalodon, apatosaurus, brachiosaurus and the sperm whale

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Q: What is the largest animal in the world that ever existed?
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