I was thinking about how they say those sails on top of some dinosaurs helped regulate their body temperature. If a dinosaur didn't have that sail, would it really make any difference?
If you heated up two towels (large ones) to 50 degrees Celsius, and spread one out, and shaped the other one into a ball, which one would cool faster?
Heat loss is largely proportional to surface area, so your spreadout towel more more efficiently cool.
About those dinosaurs. It is know that elephants large ears do get used for cooling. With a good blood supply those sails certainly could have dissipated at lot of heat. That doesn't prove that that was their primary purpose however.
