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In page Cetacea:
"Sperm whales have the largest brain mass of any animal on Earth, averaging 8,000 cm3 (490 in3) and 7.8 kg (17 lb) in mature males.[1] The brain to body mass ratio in some odontocetes, such as belugas and narwhals, is second only to humans.[2] In some whales, however, it is less than half that of humans: 0.9% versus 2.1%.[citation needed]
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