http://en.wikipedia.org/wiki/Mammal
Mammals (class Mammalia /məˈmeɪli.ə/) are a clade of endothermic amniotes distinguished from reptiles and birdsby the possession of hair,[a] three middle ear bones, mammary glands, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four-chambered heart.
Mammals (class Mammalia /məˈmeɪli.ə/) are a clade of endothermic amniotes distinguished from reptiles and birdsby the possession of hair,[a] three middle ear bones, mammary glands, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four-chambered heart.
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