Originally Posted by
kivipää
Brain mass, hovever, isn't indicative of inteelignece/sentience. First of all, a larger body requires more brain capacity simply to run all the non-concious processes of the body. Secondly, human brain is close to an optimum size in terms of the kind of brains that have evolved on this planet. Larger brains suffer from more lag and signal decay as the distances of communication between nerve ends in the brain grow, and simply putting more nerve endings into the same space would make the brain incredibly vulnerable to physical trauma, to the point where simply banging your head to that cupboard door could cause massive, permanent brain damage. It's why brain/body mass ration hasn't been a concistent indicator of relative intelligence levels, and blue whale isn't the smartest thing on the planet.