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  2. mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these characteristic milk glands, mammals are distinguished by several other unique features.

  3. Primate, in zoology, any mammal of the group that includes the lemurs, lorises, tarsiers, monkeys, apes, and humans. The order Primates, including more than 500 species, is the third most diverse order of mammals, after rodents (Rodentia) and bats (Chiroptera).

  4. Characteristics of mammals | Britannica

    www.britannica.com/summary/mammal

    mammal, Any member of the class (Mammalia) of warm-blooded vertebrates having four limbs (except for some aquatic species) and distinguished from other chordate classes by the female’s milk-secreting glands and the presence of hair at some stage of development.

  5. mammal - Kids | Britannica Kids | Homework Help

    kids.britannica.com/kids/article/mammal/353414

    A mammal is an animal that breathes air, has a backbone, and grows hair at some point during its life. In addition, all female mammals have glands that can produce milk. Mammals are among the most intelligent of all living creatures. Mammals include a wide variety of animals, from cats to humans to whales.

  6. Mammal - Classification, Class Mammalia, Monotremes, Marsupials...

    www.britannica.com/animal/mammal/Classification

    Mammal - Classification, Class Mammalia, Monotremes, Marsupials & Placental Mammals: This classification of living mammalian taxa includes the subclass Prototheria (monotremes) and the subclass Theria (live-bearing mammals), which is comprised of infraclasses Metatheria (marsupials) and Eutheria (placental mammals).

  7. Characteristics of animals | Britannica

    www.britannica.com/summary/animal

    Animals have developed muscles, making them capable of spontaneous movement (see locomotion), more elaborate sensory and nervous systems, and greater levels of general complexity. Unlike plants, animals cannot manufacture their own food and thus are adapted for securing and digesting food.

  8. Mammals Portal | Britannica

    www.britannica.com/browse/Mammals

    Mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these characteristic milk glands,...

  9. Mammal - Evolution, Classification, Adaptations | Britannica

    www.britannica.com/animal/mammal/Evolution-and-classification

    Many attributes of mammals are correlated with their highly active habit—for example, efficient double circulation with a completely four-chambered heart, anucleate and biconcave erythrocytes, the diaphragm, and the secondary palate (which separates passages for food and air and allows breathing during mastication or suckling).

  10. Animal | Definition, Types, & Facts | Britannica

    www.britannica.com/animal/animal

    Animals are multicellular eukaryotes whose cells are bound together by collagen. Animals dominate human conceptions of life on Earth because of their size, diversity, abundance, and mobility. The presence of muscles and mobility is one of the primary characteristics of the animal kingdom.

  11. Mammal - Adaptations, Physiology, Reproduction | Britannica

    www.britannica.com/animal/mammal/Form-and-function

    Mammal - Adaptations, Physiology, Reproduction: The skin is constructed of two layers, the epidermis and the dermis. Most mammals have three distinct kinds of hair: guard hairs, underfur, and whiskers.