The Physeter macrocephalus, otherwise and more commonly known as the Sperm Whale, is one of the most well-known diving cetaceans. Sperm whales are the largest predator in the world that currently co-exists with the human race, today. The sperm whale possesses the largest known brain of any living or extinct mammal, weighing an average of 17 pounds and measuring about 2.1 gallons in volume. Meet the ????? ????? ─ ??? ?????? ?? ?????? ??????