The Tyrannosaurus Rex was a large dinosaur. With the bulk of its size also came a large brain. The T-Rex had a larger brain that a lot of other dinosaurs and although it was not the smartest dinosaur out of them all it was smarter than a lot of other. The T-Rex was smarter than the Stegosaurus, the Triceratops, and the Pterodactyl. The actual smartest dinosaur was the Troodon.
This dinosaur was relatively small in size to be so smart. Its brain was actually larger than most reptiles that live today. In fact the brain of the Troodon was about the size of modern day birds making it probable for it to have been as intelligent as your average bird in today’s society.