Physeter macrocephalus — Sperm Whale - Resources of a sperm whale
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The Department of Environment and Natural Resources. Home Formerly known as Physeter catodon, the Sperm whale is the largest of the toothed whales (Odontoceti). Sperm whales have a short rounded dorsal fin and flippers. Sperm Whale. The inspiration for the white whale of Moby Dick, sperm whales have the largest heads, biggest brains, and make the loudest sound of any animal.