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Watch Bill Nye the Science Guy Season 3 Episode 18 Online

  • 7.173/10
  • COUNTRIES: United States of America
  • Subtitles: English

Scientists believe that birds evolved from reptiles. Birds have backbones, and they lay eggs, but they’ve developed a unique feature that sets them apart from all other animals – feathers. Feathers are made of the same stuff human fingernails and hair are made from – a protein called keratin. Feathers, combined with lightweight bones, powerful wings and strong hearts let birds fly.