I think you might be interested in brain science Clodagh? I had to google this one…and I found
the largest brains are those of sperm whales, weighing about 8 kg (18 lb) whereas an elephant’s brain weighs just over 5 kg – that’s 5 bags of sugar. Human brains are only around 1.5kg!
Mr. Glenzer commented on :
Human brains have the largest brains compared to body mass though compared to any other mammal.