The Troodon, is apparently the most intelligent Dinosaur. Having all of the necessary physical features that would require and suggest an intelligence that set it apart from most other dinosaurs. The T-Rex on the other hand, was a smart dinosaur, and based on the study of existing skulls and other physical features, T- Rex does appear to have had a fairly large brain by Cretaceous standards.

Some of the measures used to determine how smart a dinosaur might have been are as to whether a dinosaur was a hunter (requiring more smarts!) or a scavenger. Unfortunately for the T- Rex, there are 4 main pieces of evidence that suggest that the T. Rex of real life was more of a scavenger than a hunter.

1. T-Rex had small eyes and very weak sight, making them a less affective hunter or combatant.
2. T-Rex had small weak vestigial (front) arms, which would have been useless in combat with other dinosaurs, or fighting with live prey.
3. Although Hollywood portrays the T-Rex as a fats and agile hunter, in fact the physical and physiological evidence seems to show that the T-Rex was not as fast as made out to be. It is believed that the T-Rex may have been able to reach a poky speed of 25 mph, making it a less likely hunter of other dinosaurs.
4. The most convincing evidence is in the analysis of the T-Rex skull which shows that the T-Rex had large olfactory lobes, (large nose openings, i.e. great sense of smell) which was ideal for it to easily find the scent of dead and or rotting carcasses from miles away.

Compared to dinosaurs that hunted in packs, used pack strategy to capture prey, were keen sighted and dependant on sight to survive, were fast and agile, the T-Rex though smarter than many dinosaurs was not the smartest. The T-Rex's brain was about the size and shape of a banana, (not as big as a Human brain) and its prefrontal section (associated with thinking and decision making) like a banana was small.

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