Whales seem to have lost their sense of smell, since they spend little time in the air. It's not possible to smell under water. Instead they have developed a keen sense of taste. Whales can see very well under the water, but, above the surface they cannot see well at all. If the water is dirty and mirky whales depend on their keen sense of hearing.
Sounds travel faster in the water than the air, so whales hear sounds quickly, and from far away.
Whales have blubber, a thick layer of fat, which helps them survive when they can't find food and it keeps them warm in the cold water. A whale breathes through the opening in the top of its head known as a blowhole . It would drown if it didn't come to the surface for air time to time. Because of this a whale takes short naps many times a day. Some whales migrate, or swim all over the world, while others remain year-round in the same place.