How big can animals get?

An illustration of Argentinosaurus, possibly the most massive dinosaur that ever existed. (Image credit: Warpaintcobra via Getty Images)

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

But could any animal ever top that? Is there a limit to how large an animal can get? 

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