Really they can live in any part of the ocean. They can migrate to the arctic and antarctic region to feed on animals like seals, penguins and even polar bears occasionally. Typically, they prefer anywhere else other than polar regions but can live in the polar areas.
becaus they get sick of there old ecosystem they follow the food
polar bears share the same icy habitat polar bears share the same icy habitat
The orca is actually not a true whale, but is a member of the dolphin family. Strange, perhaps, but true. Though it isn't actually a whale, the killer whale or orca, is an apex predator. It eats whales, sea lions and seals, but really has few enemies other than man. It is an efficient predator that can learn quickly, and it is smart and adaptable. The orca is one of the most lethal hunters in the seas.
For more information, a link is provided to the Wikipedia article on the Orca.