What failed event would have had the greatest effect on the world?

The raptors showed intelligence, cooperation, and planning in the Jurrasic Park movies, but I find it hard to believe that we have any evidence relating to their behavior.

How large were their brains? Do we have any idea of dinosoaur brain structure?

 

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Dinosaur,

Not specifically, however, I do anticipate that the general rule "Brain Mass vs Body Mass" ratio held then as it does now and the Raptors did have a larger head per body size than most.

 

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Even so, their intelligence probably wouldn't have been on the same level as most mammals. Are u sure that the mass ratio-intelligence correlation is not confined only to mammals?

 

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John C.,

Not sure about that at all, only that the mass ratio reflects general intelligence.