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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.