JY Brain wars! Which animal has the biggest brain? Prev Article Next Article Yes, it’s the sperm whale! The sperm whale has the largest brain weighing in at close to 8 kilograms! In comparison, the average human brain weighs only 1.4 kilograms! Illustration: Nicholas Blechman Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Prev Article Next Article Related Posts Spider monkey – power to swing from tree to tree with 5 limbs Add Comment Cancel reply Notify me of follow-up comments by email. Notify me of new posts by email.