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Re: cause of Gigantism in sauropods

 Some (Loggerheads) in the Sargasso sea. Terrestrial analogue?

Any thick vegetation? I don't know...

 2. Because of water access, they can _and do_ lay in places with
 reduced predation pressure. Can't think of a place Titanosaurs could
 get to that their predators could not.

The predators of adult titanosaurs are rather irrelevant to their eggs, I suppose.

 3. Not sure of specifics here but would bet that sauropod eggs'
 optima were more stringent than those of turtles.