Scientific American: These Dinosaurs Had a Complicated Air Conditioner in Their Skull
Today I read an article about dinosaurs' skull. It said that dinosaurs had big body and big brain, so they easily got hot. To avoid the heat, some dinosaurs had special shape noses. Through them, the air passed long way, and breathe take some heat out of dinosaurs' body. Not to die by over heat, dinosaurs were evolved really uniquely.