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The Sperm Whale (Physeter macrocephalus) is the largest odontocete (toothed) whale. Its head contains the largest brain of any creature known to have lived on earth. The head makes up one third of its total body length, and is blunt and square with a small under slung jaw. The Sperm Whale is usually a dark brownish gray in color with lighter streaks, spots, and scratches, with a lighter gray underside sometimes marked with white patches. The skin around the mouth is white. The whale's body appears wrinkled and shriveled, particularly behind the head. A single blowhole is located forward on the left side of the head, and the blow is projected forward rather than straight up as in other whales. The Sperm Whale has a squat dorsal fin and knuckles along its spine.

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