The concept of humans having the biggest brain in regards to proportion to body size is untrue - it's another misconception.
Although we have a brain that weighs 3 lbs and measures 15 cm in length, the largest animal brain belongs to the sperm whale and it weighs a whopping 18 lbs, following second by the elephant with an 11 lbs brain.
If we're comparing brain size in proportion to body size, the shrew holds the title, due to its brain making up 10% of its body mass.
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