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Sauropod drinking

>Wow, that'd be a LOT of vegetation - considering that a creature that
>size would already need a lot, but to get its moisture requirements
>out of the same source...

Not necessarily. It depends on the vegetation. As an example, european
rabbits survive quite happily on the Nullabor in desert Australia because
what vegetation there is is semi-succulent and contains sufficient water
that the rabbits never actually need to drink. If the right vegetation was
around in the Jurassic/Cretaceous, then given the large amounts being
consumed by sauropods it might be quite reasonable for them to get what
water they needed from this source.
Graeme Worth