Proportional to its body size, which species has the largest brain?

Name: Proportional to its body size, which species has the largest brain?
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Question

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Humans have the largest brain relative to body size of any species on Earth. Brain size as a percentage of body weight decreases as body size increases across mammalian species, but humans have a higher brain-to-body-mass ratio than any other primate or mammal.

Proportional to Its Body Size, Which Species Has the Largest