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Re: sauropods: homotherm,heterotherm or gigantotherm?
Well. If a sauropod was endothermic, it could gather food much more
quickly than an ectothermic counterpart could. More important, it
would have much more efficient digestion (recall that in general a ten
degree difference in temperature doubles the speed of all chemical
(Though... keep in mind that this is about degrees Celsius.)
The biggest tortoises and lizards (e.g. _Geochelone_ and _Megalania_)
may have approached a tonne, but we have no evidence that the
significantly exceeded it.
Same for pareiasaurs. (Plus, those may have been amphibious.)
So this thing was averaging a tonne of
growth per year, or nearly 3 kg per day.
That proves it. They must have broken the secret on how to evolve cellulase.
I don't know how else to explain that kind of growth rate in the apparent
absence of milk or any parental care for the young.