Brains by the pound
The adult human brain weighs approximately 3 pounds (1300 and 1400 grams). A newborn human brain weighs 0.82 pounds (350 and 400 grams).

Elephant brain = 13.2 pounds/6,000 grams
Chimpanzee brain = 0.92 pounds/420 grams
Rhesus monkey brain = 0.20 pounds/95 grams
Beagle dog brain = 0.15 pounds/72 grams
Cat brain = .06 pounds/30 grams
Rat brain = .004 pounds/2 grams

But the Neanderthal's brain was bigger than yours is today.
(Source: Neuroscience For Kids, http://faculty.washington.edu/chudler/questions.html )
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