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  1. Cetacea - IWC

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    Cetacea are known to teach, learn, cooperate, scheme and grieve. Smaller cetaceans, such as dolphins and porpoises, engage in complex play behavior, including such things as producing stable underwater toroidal air-core vortex rings or "bubble rings".
    en.wikipedia.org
    Cetaceans, along with bats, are considered some of the most derived mammals on the planet. They evolved from terrestrial animals to an entirely aquatic life form that is completely separated from the land in all aspects of biology. Cetaceans live, breed, rest, and carry out all of their life functions in the water.
    animaldiversity.org
    The ancient Greeks recognized that cetaceans breathe air, give birth to live young, produce milk, and have hair —all features of mammals. Because of their body form, however, cetaceans were commonly grouped with the fishes.
    Having a cosmopolitan distribution, they can be found in some rivers and all of Earth's oceans, and many species inhabit vast ranges where they migrate with the changing of the seasons. Cetaceans are famous for their high intelligence, complex social behaviour, and the enormous size of some of the group's members.
    en.wikipedia.org
  3. Walvisachtigen | De Zoogdiervereniging

  4. World Cetacea Database - Intro - World Register of Marine Species

  5. WEBRead about Cetacea (dolphins, porpoises, and whales) on the Animal Diversity Web.

  6. General features of cetaceans | Britannica

    WEBcetacean , Any of the exclusively aquatic placental mammals constituting the order Cetacea. They are found in oceans worldwide and in some freshwater environments. Modern cetaceans are grouped in two …

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