Natural Selection

Natural Selection
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  • Natural Selection: Hummingbirds By Cecelia O'Sullivan
  • Food!
  • The beak size of the birds is genetic variation
  • My beak won't fit in all the way! I can't get enough food!
  • The bird with the thick, short beak can't get as much food as the bird with the long, thin beak.
  • Mine is thin and long so it goes all the way in! 
  • Eventually, the thick beaked bird dies after not getting enoug food.
  • The bird with the long, thin beak passes that trait on to her future generations.
  • The birds survive better with the long, thin beaks.
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