Toothed whale brain size with the expected brain size based on such allometric analysis provides an encephalisation quotient that can be used as another indication of animal intelligence. Sperm whales have the largest brain mass of any animal on earth, averaging and in mature males, in comparison to the average human brain which averages in mature males. The brain to body mass ratio in some odontocetes, such as belugas and narwhals, is second only to humans. Dolphins are known to engage in complex play behaviour, which includes such things as producing stable underwater toroidal air-core vortex rings or "bubble rings". Two main
People of the Whale Thomas to join them on the hunt. Marco has the job of listening for the whale, and on the day of the hunt, he is able to feel a whale as it approaches and expresses this to his father. When the whale appears, Thomas, without thinking, shoots the whale with his gun, and is suddenly flooded with harrowing memories of his experiences in the war. Chaos ensues the other men open fire on the whale, the canoe is flipped over, and Marco disappears. After returning, the men, excluding Thomas, carelessly leave the whale on the beach and go inside to