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Re: the start
>For one thing, dinosaurs were not universally large. They
>covered the whole range of sizes. The large one probably evolved
>that size for much the same reason as large mammals evolved,
>escape from predation and/or access to new food resources
>(including the ability of carnivorous forms to eat the large
However, I believe only about 2% of modern land mammals reach or exceed the
mean size of an adult dinosaur, and no dinosaurs are really small..
Those of us who are inclined towards the view of large dinosaurs as inertial
homeotherms would say that dinosaurs increased in size to gain thermal
stability, whereas mammals were decreasing in size when they become endothermic
with an increased metabolic rate, quite possibly to exploit a nocturnal niche.