Whales are mammals, large animals live only in sea or ocean. It is the animal that looks like a fish, is a slender shape, long fin and the tail of a fish. But the whale's tail, the horizontal, not vertical like a fish. The whale is an animal with small eyes and the olfactory system is inefficient good. If the whales use sound as a sensory system essentially. Similar to sonar systems Or Echo Locations Sending sound waves into contact with a foreign object and then reflected back into the ear of a whale for use in navigation. Along with their sonar, whales have other tricks they employ to keep themselves on track. Many researchers believe that whales and other migrating animals have a magnetic sense that helps them know which direction they're moving.