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Re: sauropods: homotherm,heterotherm or gigantotherm?

In the water we have huge ectotherms like whale-shark...

Yes, but it doesn't even need to carry its own weight.

On the other hand, mammals carnivores never gotten so big - the
biggest is the killer whale with more or less 5 tonnes.

Doesn't the sperm whale count?

The extinct cave bear could reach about 900 kg.

The "creodont" *Megistotherium* (literally "biggest beast") is said to have been bigger, and carnivorous (unlike the herbivorous cave bear). Then there's *Andrewsarchus*... The lack of sauropod-sized prey probably was a factor in preventing the evolution of terrestrial tyrannosaur-sized carnivorous mammals, though.