Tuesday, 2 June 2015

What are Mammals?

  • Mammals are differentiated from reptiles and birds by the possession of 
    • Hair (Normal hair that you all know)
    • Three middle ear bones (Auditory Ossicles - Malleus, Incus and Stapes)
    • Mammary Glands
    • Neocortex (a region of the brain - no image of this). 
    Three Middle Ear Bone
    Image Source: Wikipedia
      • Mammary Gland of Human
        Image Source: Wikipedia
    • The mammalian brain regulates body temperature and the circulatory system including the four-chambered heart.
    • All Female mammals nurse their young with milk, which is secreted from special glands, the mammary glands
    • Largest Mammal: Blue Whale
    • Except for the five species of monotremes (egg-laying mammals), all modern mammals give birth to live young ones. 
      • Five species are - Platypus and four species of Echidnas
      • All species indigenous to Australia and New Guinea
      • Platypus
        Image Source: Wikipedia

        Echidnas
        Image Source: Wikipedia


    Mammals in danger! - as per IUCN Red List data

    Source: Times of India





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