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Re: Atmospheric O2 Levels and Dinosaur Growth

It is probable that the biggest sauropods exceeded 100 tonnes from the Late
Jurassic to the end of the Cretaceous, so a tight correlation with any
supposed changes in oxygen levels is dubious. 

Sauropods were the only dinosaurs to regularly exceed the size of land
mammals, and their size is probably attributable to their high rates of
reproduction (see Dinosaur Eggs & Babies, 1994 Cambridge Univ Press, K
Carpenter et al eds).