Which animal has the biggest brain?

Question: Which animal has the biggest brain?
- Keywords:
  animal,
  brain
Asked by Clodagh to Kieran on 7 Nov 2018.
- Kieran answered on 7 Nov 2018:
  
  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 14 Nov 2018:

Human brains have the largest brains compared to body mass though compared to any other mammal.

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Question: Which animal has the biggest brain?