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The biggest mammalian brain on Earth

The biggest mammalian brain on Earth

Sperm whales' heads are filled with a mysterious substance called spermaceti. Scientists have yet to understand its function, but believe it may help the animal regulate its buoyancy.

COMMON NAME: Sperm Whale
SCIENTIFIC NAME: Physeter macrocephalus
TYPE: Mammals
DIET: Carnivores
GROUP NAME: Pod
SIZE: 49 to 59 ft
WEIGHT: 35 to 45 tons

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