Abstract
Macroscopic anatomical investigations on the brain of the Blue Whale (Sibbaldus musculus Linnaeus, total brain weight without dura: 6500 g), show that this species of cetacea has a degree of cerebralization between that of the primitive Southern Right Whale (Eubalaena australis Desmoulins) and that of the Humpback Whale (Megaptera novaeangliae Borowski). Of the Balaenopteridae examined to date, the Blue Whale has the lowest cerebralization.
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