... forward looking eyes, mobile arms and skilful hands. What difference does brain size make? Brain size by itself does not explain why we and other primates can be classed as intelligent. A horse's brain is more than six times larger than that of the much smaller monkey. If the two animals were of the same size, the monkey's brain would be 20 times larger than that of the horse's. Scientists do not consider horses to be exceptionally intelligent animals. It can be seen, therefore, that brain size in relation to body mass can be an indication to intelligence. Brain size on its own cannot. Different parts of the brain? Some scientists, such as Damon Clark from Princeton University, believe that the important differences concerning brain size are the sizes of the different brain components. The cerebellum (a pair of bun-like moulds), located at the base of the brain, is concerned with coordinating muscle ...

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