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How smart were they? The general answer is that every successful animal is just as smart as it needs to be. While that isn't very helpful if you're looking for an IQ score, it's significant for understanding. Big herbivores don't need particularly big brains because their need for intelligence is low: the eat, they mate, they flee from danger. The brain of a predator does need to be good and the brain of a small animal with many different predators trying to eat it hardly less good.

Tyrannosaurs had bigger brains than humans, but of course they were bigger creatures. Also, much of their brains were probably (we're guessing based on shape) devoted to sense of smell. Some man-sized dinosaurs like saurorthoides had brains as big as ostriches'.

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12y ago

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