Brain to body mass ratio
Brain to body mass ratio (also known as the Encephalisation Quotient) is a method to quickly get a rough estimate of the possible intelligence of an organism
Roughly speaking, the larger an organism is, the more brain mass is required for housekeeping tasks, such as breathing, temperature control, senses, etc. The larger the brain is relative to the body, the more brain mass might be available for more complex cognitive tasks.
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