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Which mammal has the largest brain relative to body size?
Human BodyBiology
Quick Answer
Humans have the largest brain relative to body size among mammals, with an encephalization quotient far above most other species.
The Full Story
Humans are the best-known mammal for brain size relative to body size, a measure often discussed using the encephalization quotient. The human brain averages about 1.3 to 1.4 kilograms in adults. This relative brain size is linked to advanced language, planning, and social behavior. Other mammals such as dolphins, elephants, and some primates are also highly intelligent, but human brains are unusually large for body mass.
Key Facts
1.Adult human brain: about 1.3–1.4 kg
2.Highest relative brain size among mammals
3.Linked to language and abstract reasoning
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