Killer Whale, largest member of the dolphin family. Killer whales occur in more parts of the world than probably any other cetacean (see Whale). They occur in all oceans, both in the open ocean and close to shore, but are more common in the colder, more productive waters of both hemispheres than in the Tropics. Resident populations may cover an area of several hundred square kilometers. Transient populations often move through an area rapidly, swimming …showed first 75 words of 832 total…

…showed last 75 words of 832 total…better-known whales, including the blue, finback, humpback, and gray whale, range widely and migrate between the tropics in winter and subpolar waters in summer. Humpbacks have separate populations in the northern and southern hemispheres and do not seem to cross the equator. Sperm whales and killer whales, or orcas, are wanderers without specific migratory routes. An individual sperm whale might, in its lifetime, swim around the world. Bibliography "The Beautiful Whales." by: E.G. Marshall