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The heaviest estimates for modern sauropod reconstructions are way short of blue whales, roughly in the range of fin whales.



Still, I think the point is somewhat valid, if for nothing but curiosity.

The largest dinosaur, which I know is a subject of discussion, is https://en.wikipedia.org/wiki/Argentinosaurus 30 metres, 80-100 tonnes and blue whale https://en.wikipedia.org/wiki/Argentinosaurus 30 metres, 180 tonnes

If a 100 tonnes creature can live on land, my gut tells me a 180 tonnes creature could too. where's the point of no return? There's all sorts of cooling mechanisms that could be dreamt up, just as we see strange heating mechanisms (https://en.wikipedia.org/wiki/Stegosaurus#Plates).




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