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Ratio of Saurischians/Ornithischians

There have been numerous discussions on predator/prey ratios and how the 
ratio is related to the eco system (predators need lots of prey). Are 
there any estimates (based on fossil finds) of the ratio of saurischian 
dinosaurs to ornithischians? Is that ratio fairly consistent across the 
Late Triassic, Jurassic and Cretaceous? What reasons might account for a 
greater population of one over the other? At first glance, one might 
assume that since ornithischians were primarily herbivores, they would 
outnumber the saurischians. But saurischians included both herbivores and 
carnivores, so that theory might not be tenable.

----- Amado Narvaez