Brain-to-body mass ratio, also known as the
brain to body weight ratio, is the ratio of brain mass to body mass, which is hypothesised to be a rough estimate of the
intelligence of an
animal, although fairly inaccurate in many cases. A more complex
measurement,
encephalization quotient, takes into account
allometric effects of widely divergent body sizes across several
taxa.
[13]]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.