The sperm whale has the heaviest mammal brain. Its brain weights up to 9 kg (20 lb), six times heavier than a human brain. The whale has a very large head, about a third of its body length, so there is plenty of room for its big brain.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/the-sperm-whale-has-the-heaviest-mammal-brain/

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