• The Cenozoic began with the extinction of every land creature larger than a dog.
  • Mammals have adapted to all sorts of different environments.
  • They can walk, swim, or blubber for warmth.
  • As climate cooled during the ice ages, large mammals evolved.
  • Mastodons, giant sloths, wooly mammoths, giant condors, and saber tooth cats all evolved.
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