• Mammals are a class of endothermic vertebrates.
  • They have four limbs and produce amniotic eggs.
  • Female mammals have mammary glands.
  • The glands produce milk after the birth of offspring.
  • Mammals have hair or fur.
  • It insulates the body and can be used for sensing and communicating.
  • Most mammals share several other traits.
  • The traits in the following list are typical of, but not necessarily unique to, mammals.
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