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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.
The largest and heaviest whales â TOP 20. Whales have different sizes. Among them are small, such as the pygmy spermwhale â 3.5 m (11 ft), and those huge, that stimulate our imagination like the blue whale and humpback. The biggest whales are the largest animals that ever existed on Earth. Certainly whales are the heaviest animals that ever existed. Whales are heavier than the heaviest dinosaurs, such as Argentinosaurus or Amphicoelias. Whales are long-lived animals. Some of them live more than 200 years â eg. humpback and bowhead. Whales inhabit all the worldâs oceans.