5 Saison
100 Épisode
Bill Nye the Science Guy - Season 3 Episode 18 Épisode 18 (1998)
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.
- Pays : United States of America
- Genre : Comedy, Documentary, Kids
- Studio : PBS
- Réalisateur : Bill Nye
- Jeter : Bill Nye, Rachel Glenn, Jennifer Lin, Amy Broder, Ethan Ferkiss
