Needaham45
Spaceman
I'm not going to prove anything. Obviously what your saying makes sense, I'm just saying what scientists believe. And also (if I recall) large animals like the hippo, elephant, and dinosaurs actually have extremely small brains. Dinosaurs are believed to have brains about the size of a peanut. That's smaller than a squirrel (I think). I really don't know everything behind this scientific belief, only that it exists.