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  1. Whales, dolphins, and porpoises
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    Cetacea (/ sɪˈteɪʃə /; from Latin cetus ' whale ', from Ancient Greek κῆτος (kêtos) ' huge fish, sea monster ') is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins, and porpoises.
    cetacean, (order Cetacea), any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises. The ancient Greeks recognized that cetaceans breathe air, give birth to live young, produce milk, and have hair —all features of mammals.
    Cetaceans are a group of aquatic mammals that includes whales, dolphins, and porpoises. They have a streamlined body shape, blowholes for breathing, and flippers for swimming. They range in size from the 1.5 meter (5 foot) vaquita porpoise to the 30 meter (98 foot) blue whale.
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    Cetacea is an infraorder of aquatic mammals belonging to the order Artiodactyla that includes whales, dolphins, and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel themselves through the water with … Meer weergeven

    The two parvorders, baleen whales (Mysticeti) and toothed whales (Odontoceti), are thought to have diverged around thirty … Meer weergeven

    Range and habitat
    Cetaceans are found in many aquatic habitats. While many marine species, such as the blue whale, the humpback whale and the Meer weergeven

    Reproduction and brooding
    Most cetaceans sexually mature at seven to 10 years. An exception to this is the La Plata dolphin, which is sexually mature at two years, … Meer weergeven

    Cetacean bodies are generally similar to those of fish, which can be attributed to their lifestyle and the habitat conditions. Their body … Meer weergeven

    Circulation
    Cetaceans have powerful hearts. Blood oxygen is distributed effectively throughout the body. … Meer weergeven

    Sleep
    Conscious breathing cetaceans sleep but cannot afford to be unconscious for long, because … Meer weergeven

    Brucellosis affects almost all mammals. It is distributed worldwide, while fishing and pollution have caused porpoise population density … Meer weergeven

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  4. WEB11 apr. 2024 · Cetaceans are aquatic mammals that include whales, dolphins, and porpoises. Learn about their body form, function, respiration, circulation, and thermoregulation from Britannica's experts.

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

  6. Cetaceans Facts, Complete Guide To Whales, Dolphins & Porpoises

  7. WEB5 mrt. 2020 · Cetaceans are mammals that live in the ocean and have evolved from even-toed ungulates. They are divided into two sub-orders: baleen whales and toothed whales, which feed differently and have …

  8. 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 …

  9. Cetacea - IWC

  10. Walvisachtigen - Animalia

  11. WEBLearn about the Cetacea, the order of mammals that includes whales and dolphins. Explore their distinctive features, fossil history, and living species with photos and descriptions.

  12. WEBCetaceans are distributed in all the world’s oceans from the far polar reaches to the Equator. They concentrate in areas of increased biological productivity, such as upwellings where there is an abundant supply of …