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
Brain Exercise with Dr. Kawashima where every game will be played while monitoring its effect on the brain of the player. Brain Exercise with Dr. Kawashima The game is structured around a set of 15 minigames which are used in the different game modes. After selecting a profile (there are 3 slots for different users) a cel-shaded 3D Dr. Kawashima will accompany the player when browsing the menus and will explain the minigames. After playing each minigame in any of the game modes, player's performance is rated via a ranking of items found in nature, which includes creatures such as plankton, a whale or a