Bill Nye the Science Guy - Season 3 Episode 18 Birds
- Genre : Comedy, Documentary, Kids
- Année : 1998
- Réalisateur : Bill Nye
- Acteur : Bill Nye, Rachel Glenn, Jennifer Lin, Amy Broder, Ethan Ferkiss
- Pays : United States of America
- studio : PBS
- 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.
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