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There are about 86 species of whales, dolphins and porpoises in the Order Cetacea, which is further divided into two sub-orders, the Odontocetes, or toothed whales and the Mysticetes, or baleen whales. Cetaceans can differ greatly in their appearance, distribution, and behavior.
1 There are two suborders of whales to which all species of whales belong: toothed whales and baleen whales. 2  Toothed whales include sperm, killer, and beluga whales, and they prey on large fish in deep waters as their main source of food. Whales belong to the order cetacean, meaning they are mammals that are fully adapted to aquatic life. 2  Like dolphins and porpoises, whales are believed to have descended from land animals that returned to the water roughly 50 million years ago after living millions of years on land. 3  b.