Mammals as well as warm-blooded animals (homoioterm), his body coated by hair plays a vital role in regulating body temperature. the most characteristic of mammals have mammary glands that manufacture milk once giving birth, respiratory instrument of the lungs. Closed circulatory system, as well as twin circulation, copy by birth (except animal or Ornithorinchus duck-billed, with egg-laying), internal fertilization. Example: horses, cattle, goats, whales, dolphins, and therefore forth.
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