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| |Species||Simple brain-to body ratio (E:S)| Brain-to-body mass
ratio, also known as the brain to body weight ratio, is the
ratio of brain weight to body weight, which is hypothesised to
be a rough estimate of the intelligence of an animal. A more
complex measurement, encephalization quotient, takes into
account allometric effects of widely divergent body sizes across
several taxa. The raw brain-to-body mass ratio is however
simpler to come by, and is still a useful tool for comparing
encephalization within species or between fairly closely related
species. Brain-body size relationship Edit Brain size usually
increases with body size in animals (is positively correlated),
i.e. large animals usually have larger brains than smaller
animals. The relationship is not linear however. Small mammals
like mice have a direct brain/body size similar to humans, while
elephants have comparatively sm