• Many mammals live in social groups.
  • Social living evolved because it is adaptive.
  • Mammals may have limbs that are specialized for a particular way of moving.
  • They may be specialized for running, jumping, climbing, flying, or swimming.
  • The fastest land animal is a predatory mammal.
  • Can you guess what it is?
  • Racing at speeds of up to 112 kilometers (70 miles) per hour, the cheetah wins hands down.
  • That’s because the limbs are attached beneath the body, rather than at the sides as in reptiles (see Figure below).
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