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My humble $.02.

Wasn't the climate more equable during the Cretaceous?  Therefore water loss
would not have been as much of a problem.

Also, Mickey is right about ectotherms (at least from what I've heard in
my Earth Evolution class this semester) not needing RTs.  And nobody has
mentioned obligate homeotherms yet.  IF dinosaurs were obligate homeotherms
there would be little need to concern themselves with water loss.  They
have the best of both worlds, (i.e. the benefits of endotherms at the food
cost of ectotherms) {Dr. Wells would be proud.}

A new lurker and PUG plodding towards paleontology.