How big can animals get?

An illustration of it Argentinosaurusperhaps the most massive dinosaur that ever lived. (Image credit: Warpaintcobra via Getty Images)

The largest animal to ever walk the Earth was probably the dinosaur Argentinosaurus, a massive 77-ton (70 metric tons) titanosaur that lived about 90 million years ago during the Late Cretaceous period. For comparison, the heaviest animal on land today is the African elephant (Loxodonta), which weighs less than 7 tons (6 metric tons). Both look positively elegant next to blue whale (Balaenoptera musculus), which, at an average of 165 tonnes (150 metric tons), may be the heaviest animal to have ever lived.

But could any animal top it? Is there a limit to how big an animal can get?

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