Did all dinosaurs have small brains?
The best they can tell, from examining the crania of what dinosaurs they have pieced together, they had very small, extremely small brains compared to body size. Most of their brains were involved with movement of their tremendous bodies, feeding, etc. The crania are smooth, meaning the brain had no “folds/wrinkles”, i.e., no gray matter. They did not “think” …even on a guinea pig level. They were huge, lumbering, feeding machines. There were predators, like Tyrannosaurus, and they had the largest brains, as all predators do, but their brains were not even as well developed as a modern lizard. The beginnings of “intelligence” as we define it, did not appear till the first small mammals made their debut…at the end of the Jurrassic Epoch.
