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On Dec 5, 12:58pm, Mickey P. Rowe wrote:

> I think you're missing an important point about the RT arguments here.
> Endothermic animals potentially lose a lot of water via exhalation
> because elevated body temperatures increase the capacity of the
> exhaled air to carry water.  Combine that with the higher ventilation
> rates necessary for maintaining metabolism...  A desert ectotherm
> shouldn't be expected to lose nearly as much water as a desert
> endotherm all other things (e.g. RT's) being equal.

Plus, of course, the very significant reduction in water loss that that
reptiles achieved by switching to uric acid elimination of nitrogen
rather than urea - dinosaurs almost certainly resembled desert
lizards rather than mammals in that respect.

Tony Canning
tonyc@foe.co.uk